The oil and gas industry in Illinois plays a significant role in the state’s economy, featuring a blend of exploration, production, and distribution operations. This sector hosts a range of companies all involved in extracting and supplying energy resources. From independent producers to family-owned companies, these establishments also offer essential services such as transportation and logistics. The industry's future looks to incorporate advancements in sustainable practices and cleaner energy sources, with an increasing focus on environmental compliance and innovation in efficiency.

Illinois is home to notable oil and gas companies, varying in size, specialization, and age. Ranging from smaller businesses with fewer than ten employees to larger firms employing hundreds, these companies fulfill vital roles in the industry. Established between 1911 and 2011, they engage in activities like petroleum distribution, crude oil purchasing, and fuel supply. Their operations stretch across the state, ensuring essential resources for local industries and consumers alike.

Continue reading to discover the top oil and gas companies in Illinois.

Top 24 Oil And Gas Companies in Illinois

1. Pioneer Oil Company, Inc.

• Website: pioneeroil.net
• Ownership type: Corporate
• Headquarters: Lawrenceville, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $540.0M, August 2007
• Founded year: 1972
• Headcount: 1-10
• LinkedIn: pioneer-oil-company-inc.

Pioneer Oil Company, Inc., based in Lawrenceville, Illinois, has been a part of the oil and gas industry since its establishment in 1972. The company specializes in providing services related to oil extraction and management, catering primarily to independent oil and gas producers and operators. With a focus on expertise and support, Pioneer Oil Company plays a crucial role in assisting these smaller entities navigate the complexities of the oil sector. The company is actively involved in several industry associations, including the Illinois Oil and Gas Association and the Indiana Oil & Gas Association, which underscores its commitment to promoting the development of the oil industry. Over the years, Pioneer has received recognition for its contributions, including multiple awards from the Illinois Oil and Gas Association. The company has also secured significant funding, with a reported amount of $540 million in 2007, which reflects a level of financial backing that supports its operations and initiatives.

2. Parent Petroleum

• Website: parentpetroleum.com
• Ownership type: Family Owned
• Headquarters: St. Charles, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1983
• Headcount: 51-200
• LinkedIn: parent-petroleum

Parent Petroleum, Inc., founded in 1983 and based in St. Charles, Illinois, is a family-owned business that specializes in the distribution of fuel and lubricants. The company serves a wide range of customers, including retail, commercial, and industrial sectors, providing quality products along with technical support. Their Fuels Division focuses on the service and sales of fuel products, while the Lubricants Division boasts over 150 years of combined lubricant knowledge, offering solutions tailored to fleet, commercial, and industrial needs. Parent Petroleum also operates retail stores under the brand 'The PRIDE,' emphasizing customer service and community engagement. In addition to their core business, they are involved in real estate development through CIMA Developers, LP. The company is committed to philanthropy, with initiatives aimed at supporting health, education, and human services in their community, further solidifying their role in the industry.

3. BioBlend Renewable Resources, LLC

• Website: bioblend.com
• Ownership type: Private
• Headquarters: Park Ridge, Illinois, United States (USA)
• Employee distribution: United States (USA) 84%, Canada 16%
• Founded year: 2007
• Headcount: 11-50
• LinkedIn: bioblend-renewable-resources-llc

BioBlend Renewable Resources, LLC, founded in 2007 and based in Park Ridge, Illinois, is a manufacturer of biodegradable industrial lubricants and greases. The company caters to various industries, including agriculture, construction, and notably, oil and gas. BioBlend's products are designed to provide sustainable alternatives to conventional petroleum-based lubricants, helping businesses meet environmental regulations while ensuring high performance. Their offerings include a range of lubricants certified as USDA BioPreferred and classified as Environmentally Acceptable Lubricants (EALs) by the EPA. This commitment to sustainability is reflected in their continuous development of innovative products that align with the growing demand for eco-friendly solutions in the oil and gas sector.

4. Feece Oil Co

• Website: feeceoilfuel.com
• Ownership type: Family Owned
• Headquarters: Minooka, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1934
• Headcount: 51-200
• LinkedIn: feece-oil-co

Feece Oil Co, established in 1934, is a family-owned business based in Minooka, Illinois. The company specializes in supplying fuel and lubricants, offering a range of products including gasoline, diesel, and maintenance services. They serve various industries such as agriculture, construction, mining, and municipalities, ensuring that their clients have reliable access to the fuel and lubricants necessary for their operations. Feece Oil Co operates multiple locations in Illinois and provides services within a 100-mile radius of Chicago. Their offerings include on-site fueling solutions, rental tanks, and a full line of lubricants, demonstrating their commitment to meeting the needs of their customers. The company has not reported any funding, indicating that it operates independently without external financial backing.

5. Bi-Petro Inc.

• Website: bipetro.com
• Ownership type: Private
• Headquarters: Springfield, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1973
• Headcount: 51-200
• LinkedIn: bi-petro-inc-

Bi-Petro Inc. is a privately owned company based in Springfield, Illinois, that specializes in the purchase of crude oil from independent producers in the Illinois Basin. Established in 1973, Bi-Petro has built a reputation for providing prompt payments and exceptional customer service to its clients. The company not only buys crude oil but also offers transportation services, ensuring efficient operations for oil producers. With a workforce of approximately 75 employees, Bi-Petro is dedicated to supporting independent oil producers by facilitating their operations and enhancing their cash flow through various pricing programs. The company has expanded its services over the years, including the establishment of multiple unload facilities and a transportation division, which underscores its commitment to the oil market and its producers.

6. Black Dog Corporation

• Website: blackdogcorp.com
• Ownership type: Private
• Headquarters: Lyons, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2006
• Headcount: 11-50
• LinkedIn: black-dog-corporation

Black Dog Corporation, founded in 2006 and based in Lyons, Illinois, is a private petroleum distribution firm. The company specializes in supplying a range of products including gasoline, diesel, oils, lubricants, and chemicals. They cater to a variety of sectors such as municipal fleets, railroads, construction, and utilities, ensuring that their clients have the necessary resources for efficient operations. Black Dog also provides services like logistics support and fuel management, enhancing their value proposition in the industry. The firm is recognized as a certified minority-owned business, holding MBE, DBE, ACDBE, and NMSDC certifications. This status has enabled them to secure significant contracts with governmental entities and expand their client base. Their commitment to innovative solutions and competitive pricing has established them as a reliable partner in the petroleum distribution market.

7. Blu Petroleum, Inc.

• Website: blupetroleum.com
• Ownership type: Private
• Headquarters: Mundelein, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2011
• Headcount: 11-50
• LinkedIn: blu-petroleum-inc

Blu Petroleum, Inc., founded in 2011 and based in Mundelein, Illinois, operates as a petroleum distributor. The company provides a wide array of fuel products, including gasoline, diesel, biodiesel, kerosene, and lubricants, catering to businesses across various sectors. Blu Petroleum emphasizes reliable fuel delivery and management solutions, ensuring that clients can focus on their core operations without the hassle of fuel logistics. The company also offers services such as onsite delivery, tank monitoring, and fuel analysis, which enhance operational efficiency for its customers. With a commitment to quality and sustainability, Blu Petroleum sources its products from trusted suppliers and incorporates eco-friendly alternatives into its offerings. The company has not reported any funding, indicating it operates as a private entity without external financial backing.

8. State Oil Company

• Website: stateoilcompany.com
• Ownership type: Private
• Headquarters: Libertyville, Illinois, United States (USA)
• Founded year: 1947
• Headcount: 51-200
• LinkedIn: state-oil-company

State Oil Company of Illinois, founded in 1947 and based in Libertyville, Illinois, is a private fuel supplier specializing in the distribution of both branded and un-branded gasoline and diesel fuel. The company caters to a variety of clients, including businesses and individual consumers, who require fuel for transportation and operational needs. In addition to fuel supply, State Oil Company offers financial assistance and advanced digital pricing signs to enhance customer service and operational efficiency. Their focus on transport loads indicates a commitment to meeting the logistical demands of their clientele, although they do not engage in the upstream or refining sectors of the oil and gas industry.

9. Express Petroleum

• Website: expresspetroleum.co.za
• Ownership type: Private
• Headquarters: Granite City, Illinois, United States (USA)
• Employee distribution: South Africa 84%, United States (USA) 16%
• Founded year: 1994
• Headcount: 1-10
• LinkedIn: express-petroleum

Express Petroleum, founded in 1994, is a private logistics and fuel distribution company based in Granite City, Illinois, with a significant operational presence in South Africa. The company specializes in the supply of high-quality fuels and Shell lubricants, catering to both retail and commercial sectors. With a fleet of 36 modern bulk fuel tankers, Express Petroleum serves a wide area that includes the Eastern Cape, Transkei, and Southern Free State. The company emphasizes service excellence, ensuring timely deliveries and maintaining strong relationships with its customers. As one of the largest independent distributors of bulk fuels in the Eastern Cape, Express Petroleum has established itself as a reliable player in the fuel market, focusing on quality and customer satisfaction.

10. Huels Oil Company

• Website: huelsoil.com
• Ownership type: Family Owned
• Headquarters: Carlyle, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1976
• Headcount: 11-50
• LinkedIn: huels-oil-company

Huels Oil Company, based in Carlyle, Illinois, has been a family-owned business since its founding in 1976. With a workforce of 11 to 50 employees, the company specializes in logistics and fuel supply, providing high-quality fuels and lubricants to various businesses and organizations. Their services include tank wagon delivery and wholesale transports, covering a fifteen-county area for fuel deliveries and a broader region for lubricants. As a Chevron 1st Source Marketer, Huels Oil Company emphasizes the importance of clean lubricants through their ISOCLEAN® Certified Lubricant Management program. This focus on quality and service has allowed them to maintain a loyal customer base and expand their operations over the years. They have also engaged in strategic acquisitions to enhance their service offerings, demonstrating their commitment to growth within the oil and gas industry.

11. Maverick Energy Inc.

• Website: maverickenergyinc.com
• Ownership type: Venture Capital
• Headquarters: Robinson, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Seed, July 2019
• Founded year: 1980
• Headcount: 1-10
• LinkedIn: maverick-energ-yinc

Maverick Energy Inc., based in Robinson, Illinois, is an energy company founded in 1980. The firm specializes in clean energy solutions and natural resource production, with a particular emphasis on coalbed methane extraction and renewable natural gas. They provide services to energy investors and agricultural businesses, aiming to lower energy costs and emissions while promoting sustainable practices. Maverick operates more than 300 wells in the Illinois Basin, focusing on innovative techniques like horizontal drilling to enhance productivity and recovery yields. The company is also involved in economic development initiatives, seeking partnerships to leverage their natural gas resources for agricultural advancements. Their operations reflect a commitment to improving energy efficiency and security, while also contributing to local job creation and environmental benefits.

12. Gas Depot Inc

• Website: gasdepot.com
• Ownership type: Corporate
• Headquarters: Morton Grove, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: January 2023
• Founded year: 1999
• Headcount: 11-50
• LinkedIn: gas-depot-inc

Gas Depot Inc, founded in 1999 and based in Morton Grove, Illinois, operates as a petroleum distributor specializing in both wholesale distribution and retail operations of petroleum products. The company serves a variety of clients, including petroleum dealers and convenience store operators, by providing essential services such as real estate selection, construction, and equipment selection. With a strong presence in the Midwest, particularly in Illinois, Indiana, and Missouri, Gas Depot is licensed to distribute both branded and unbranded products, including well-known names like Shell, Citgo, and Marathon. Their commitment to operational excellence and customer service has established them as a reliable partner in the petroleum industry, supporting the growth of their clients through competitive distribution and delivery of petroleum products.

13. Murphy Trucking

• Website: murphytruckinginc.com
• Ownership type: Family Owned
• Headquarters: Casey, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1977
• Headcount: 11-50
• LinkedIn: murphy-trucking

Murphy Trucking Inc., founded in 1977, is a family-owned logistics company based in Casey, Illinois. Initially starting as Murphy Tank Truck Service, the company has grown from a single truck operation to a fleet of over 30 trucks. They specialize in transportation services tailored for the oil industry, including crude oil hauling, vacuum truck services, and water hauling. Over the years, Murphy Trucking has developed strong partnerships with key players in the oil sector, such as Countrymark Refining & Logistics and Plains Marketing. Their commitment to quality service and safety has allowed them to maintain a solid reputation in the Illinois Basin, where they primarily operate. The company continues to serve the needs of the oil industry, demonstrating their relevance and importance in this sector.

14. GTI Energy

• Website: gti.energy
• Ownership type: Corporate
• Headquarters: Des Plaines, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: December 2008
• Founded year: 1941
• Headcount: 201-500
• LinkedIn: gas-technology-institute

GTI Energy, based in Des Plaines, Illinois, has been active since 1941, focusing on the development of innovative energy solutions. The company specializes in consulting and research services tailored for the energy sector, particularly in natural gas. Their expertise spans various areas, including hydrogen, methane emissions, carbon management, and energy efficiency. GTI Energy collaborates with industrial firms, government agencies, and private investors to tackle energy challenges and facilitate the transition to sustainable energy systems. Their technical services and analytical capabilities support clients in optimizing energy use and improving infrastructure integrity. With a workforce of over 500 employees, GTI Energy plays a significant role in advancing technologies that enhance the efficiency and sustainability of energy systems.

15. Weichai America CORP.

• Website: weichaiamerica.com
• Ownership type: Private
• Headquarters: Rolling Meadows, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: weichai-america-corp.

Weichai America Corp., established in 2009 and based in Rolling Meadows, Illinois, is a subsidiary of Weichai Group, a prominent global engine manufacturer. The company specializes in the production of diesel and natural gas engines, along with various industrial components. Weichai America is dedicated to delivering reliable power solutions tailored for the North American commercial market, with a particular emphasis on agriculture and oil and gas drilling applications. Their extensive research and development facility in Illinois focuses on creating clean-burning alternative fuel engines, which are crucial for meeting the evolving demands of the energy sector. Weichai America also provides essential service parts, ensuring that their products maintain optimal performance in the field. The company’s strategic investments and partnerships further enhance its capabilities in the oil and gas industry, positioning it as a key player in providing innovative power solutions.

16. Smith Oil Corporation

• Website: smithoilcorp.com
• Ownership type: Private
• Headquarters: Rockford, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1911
• Headcount: 11-50
• LinkedIn: smith-oil-corp

Smith Oil Corporation, based in Rockford, Illinois, has been a staple in the fuel delivery industry since its founding in 1911. This family-owned business specializes in the distribution of a variety of petroleum products and lubricants, catering to sectors such as construction, agriculture, and home heating. With a workforce of 11 to 50 employees, Smith Oil emphasizes on-site delivery and emergency services, ensuring that both commercial and residential customers receive prompt and reliable service. Their product offerings include alternative fuels, biodiesel, gasoline, heating oils, and specialized lubricants, tailored to meet the specific needs of their clientele. The company prides itself on its commitment to customer satisfaction and has built a reputation for quality service over more than a century of operation.

17. Les Wilson, Inc. (Oil Drilling and Service)

• Website: leswilsoninc.com
• Ownership type: Private
• Headquarters: Carmi, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1940
• Headcount: 51-200
• LinkedIn: les-wilson-inc.-oil-drilling-and-service-_2

Les Wilson, Inc. is an oil drilling company based in Carmi, Illinois, with a history spanning over 70 years. Founded in 1940, the company specializes in providing rotary and service rigs, as well as trucking and support equipment tailored for the oil and gas industry. Their operations extend across various states in the U.S., including Pennsylvania, Illinois, Michigan, Oklahoma, Indiana, and Kentucky. Les Wilson, Inc. prides itself on maintaining high-quality equipment that incorporates cutting-edge technology, ensuring durability and efficiency in drilling operations. The company emphasizes safety, implementing rigorous safety protocols and a zero-tolerance drug and alcohol policy to protect its workforce. With a dedicated team and a strong commitment to service, Les Wilson, Inc. continues to play a significant role in the oil drilling sector.

18. Midwestern Contractors

• Website: midwesterncontractors.com
• Ownership type: Corporate
• Headquarters: Elburn, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: December 2013
• Founded year: 1951
• Headcount: 201-500
• LinkedIn: midwestern-contractors

Midwestern Contractors, founded in 1951 and based in Elburn, Illinois, is a construction firm that specializes in the construction and maintenance of infrastructure for oil, gas, bio-gas, and industrial gas. The company offers a wide range of services, including pipeline construction, electrical installations, and station maintenance. They have built a reputation for executing projects safely and efficiently, working with various gas types such as natural gas, CO2, and hydrogen. Their expertise extends to high-pressure pipelines and integrity programs, ensuring that critical energy infrastructure is maintained to high standards. Midwestern Contractors employs a skilled workforce, including welders, electricians, and project managers, who are trained to meet industry safety and technical requirements. Their commitment to environmental protection and community support further underscores their role in the energy sector.

19. HWRT Oil Company, LLC

• Website: hwrtoil.com
• Ownership type: Family Owned
• Headquarters: Hartford, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1976
• Headcount: 11-50
• LinkedIn: hwrt-oil-company-llc

HWRT Oil Company, LLC, based in Hartford, Illinois, is a family-owned petroleum supplier that has been in operation since 1932. Originally founded as Piasa Motor Fuels, the company has grown significantly over the decades. HWRT specializes in providing a range of fuels, including gasoline, diesel, ethanol, and biodiesel, primarily serving businesses in the transportation and logistics sectors. With multiple terminals across the Central U.S., HWRT ensures a reliable fuel supply to support its customers' operations. The company has a strong emphasis on customer service and competitive pricing, which has helped it maintain a solid reputation in the industry. HWRT has also been proactive in integrating renewable fuels into its product offerings, becoming one of the first terminals in the country to offer E15 and actively marketing biodiesel since 2004. This adaptability highlights their commitment to evolving with industry trends and customer needs.

20. Graham Enterprise, Inc.

• Website: grahamei.com
• Ownership type: Private
• Headquarters: Vernon Hills, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1922
• Headcount: 201-500
• LinkedIn: grahamenterpriseinc

Graham Enterprise, Inc. is a privately owned fuel distributor and retail provider based in Vernon Hills, Illinois. Established in 1922, the company has a rich history in the petroleum industry, beginning with the purchase of a Standard Oil Station. Over the decades, Graham Enterprise has evolved, becoming a significant distributor for major brands such as BP, Citgo, Marathon, Shell, and ExxonMobil. The company specializes in wholesale fuel distribution and retail fuel sales, serving both businesses and consumers. In addition to fuel services, they operate car wash facilities, enhancing their service offerings. With a commitment to high-quality fuel and customer service, Graham Enterprise has achieved impressive distribution volumes, reaching over 250 million gallons annually. Their focus on customer satisfaction and community involvement, including scholarship programs, further underscores their dedication to the industry and the communities they serve.

21. Nicor Gas

• Website: nicorgas.com
• Ownership type: Private
• Headquarters: Naperville, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1954
• Headcount: 1001-5000
• LinkedIn: nicor-gas

Nicor Gas, founded in 1954 and based in Naperville, Illinois, is a private natural gas distribution company that serves over two million customers across the state. The company operates an extensive network of nearly 34,000 miles of pipelines, ensuring the safe and efficient delivery of natural gas for residential and commercial use. Nicor Gas is committed to energy efficiency and offers various programs to assist customers in managing their energy consumption. The company also emphasizes safety and reliability in its operations, providing essential services such as meter reading and emergency response. With a workforce of approximately 1,441 employees, Nicor Gas is dedicated to supporting the communities it serves through initiatives that promote conservation and economic development.

22. REP Sales, Inc.

• Website: repsales.net
• Ownership type: Private
• Headquarters: Olney, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1984
• Headcount: 11-50
• LinkedIn: rep-sales-inc-

REP Sales, Inc., founded in 1984 and based in Olney, Illinois, is a manufacturers' representative agency dedicated to the oil and gas industry. The company specializes in sourcing and supplying a wide array of products necessary for drilling, production, and transportation operations. With a team that boasts over a century of combined experience, REP Sales leverages its extensive network of relationships with manufacturers to deliver specialized equipment and supplies to clients. They maintain warehouses in Olney, IL, and Midvale, OH, allowing for efficient distribution across several states, including Illinois, Indiana, Kentucky, and New York. Their services include warehousing, delivery, sales, and consulting, all tailored to meet the unique needs of their customers in the oil and gas sector. REP Sales represents 19 manufacturers and has the capability to source a variety of products, from valves and fittings to safety equipment and environmental solutions, making them a crucial link in the supply chain for oil and gas operations.

23. Midwest Services Group

• Website: midwestservices.com
• Ownership type: Private
• Headquarters: Vandalia, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: midwest-services-group

Midwest Services Group, founded in 2009 and based in Vandalia, Illinois, is a private company that operates as a pipeline contractor. The firm specializes in the construction and maintenance of infrastructure for the gas, oil, and renewable energy sectors. Their comprehensive service offerings include pipeline construction, right-of-way maintenance, and civil construction and restoration. With a dedicated team, they focus on ensuring safety and efficiency in their operations, catering primarily to businesses in the energy industry. Their commitment to maintaining the integrity of infrastructure is evident in their proactive approach to project management and regulatory relations. Midwest Services Group also emphasizes safety training and environmental stewardship, which are critical in the energy sector. They have built a reputation for reliability and quality in their services, making them a notable player in the oil and gas industry.

24. Brindley Engineering Corporation

• Website: brindleyengineering.com
• Ownership type: Private
• Headquarters: Lisle, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2004
• Headcount: 51-200
• LinkedIn: brindley-engineering

Brindley Engineering Corporation, founded in 2004 and based in Lisle, Illinois, is a private engineering firm with a workforce of approximately 154 employees. The company specializes in providing a range of engineering services, including capital and maintenance projects, construction solutions, and reliability initiatives. Brindley Engineering serves clients across multiple industries, with a significant focus on oil and gas, chemical and petrochemical, power, and manufacturing sectors. Their expertise in oil and gas spans upstream, midstream, and downstream operations, where they deliver solutions aimed at maximizing capital investments and minimizing downtime. The firm operates with a commitment to enhancing infrastructure reliability, making them a valuable partner for companies in the oil and gas industry.

Oil And Gas Insights: Key Companies in Illinois

Company	Headquarter	Size	Founded	Ownership
Pioneer Oil Company, Inc.	Lawrenceville, Illinois, United States (USA)	1-10	1972	Corporate
Parent Petroleum	St. Charles, Illinois, United States (USA)	51-200	1983	Family Owned
BioBlend Renewable Resources, LLC	Park Ridge, Illinois, United States (USA)	11-50	2007	Private
Feece Oil Co	Minooka, Illinois, United States (USA)	51-200	1934	Family Owned
Bi-Petro Inc.	Springfield, Illinois, United States (USA)	51-200	1973	Private
Black Dog Corporation	Lyons, Illinois, United States (USA)	11-50	2006	Private
Blu Petroleum, Inc.	Mundelein, Illinois, United States (USA)	11-50	2011	Private
State Oil Company	Libertyville, Illinois, United States (USA)	51-200	1947	Private
Express Petroleum	Granite City, Illinois, United States (USA)	1-10	1994	Private
Huels Oil Company	Carlyle, Illinois, United States (USA)	11-50	1976	Family Owned
Maverick Energy Inc.	Robinson, Illinois, United States (USA)	1-10	1980	Venture Capital
Gas Depot Inc	Morton Grove, Illinois, United States (USA)	11-50	1999	Corporate
Murphy Trucking	Casey, Illinois, United States (USA)	11-50	1977	Family Owned
GTI Energy	Des Plaines, Illinois, United States (USA)	201-500	1941	Corporate
Weichai America CORP.	Rolling Meadows, Illinois, United States (USA)	11-50	2009	Private
Smith Oil Corporation	Rockford, Illinois, United States (USA)	11-50	1911	Private
Les Wilson, Inc. (Oil Drilling and Service)	Carmi, Illinois, United States (USA)	51-200	1940	Private
Midwestern Contractors	Elburn, Illinois, United States (USA)	201-500	1951	Corporate
HWRT Oil Company, LLC	Hartford, Illinois, United States (USA)	11-50	1976	Family Owned
Graham Enterprise, Inc.	Vernon Hills, Illinois, United States (USA)	201-500	1922	Private
Nicor Gas	Naperville, Illinois, United States (USA)	1001-5000	1954	Private
REP Sales, Inc.	Olney, Illinois, United States (USA)	11-50	1984	Private
Midwest Services Group	Vandalia, Illinois, United States (USA)	51-200	2009	Private
Brindley Engineering Corporation	Lisle, Illinois, United States (USA)	51-200	2004	Private

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