- Alagasco Gas Corporation
 - Natural gas distribution - Corning Natural Gas Corporation
- Provides natural gas, transportation, storage and other unbundled energy services in the southern tier of New York.
- Delta Natural Gas Co, Inc.
- Distributes natural gas in central and southeastern Kentucky.
- Energy West, Inc.
- Natural gas utility and retail propane company serving Montana, Wyoming, and Arizona.
- Greeley Gas Company
- Natural gas and propane distributor.
- Laclede Gas Company
- Public utility engaged in the retail distribution of natural gas.
 Lattice Group@
- MDU Resources Group, Inc.@
- North Carolina Natural Gas
- Providing natural gas and propane related services to customers in south central and eastern North Carolina.
- NUI
- Owns several natural gas distribution companies in six east coast states.
- Ohio Valley Gas Corporation
- Provides rules, regulations, rates, and contact information for the company's service areas.
- Oneok, Inc. (5)
- Paraco Gas Corporation
- Propane gas and equipment, industrial gases, or other related products and service.
- Piedmont Natural Gas Company (1)
- Pinnacle CNG
- Manufactures, sells, and operates automatic, unmanned Compressed Natural Gas (CNG) re-fueling sites. Site includes information on fueling solutions and the hydraulic intensifier compressor (HIC).
- ProLiance Energy
- Supplier of natural gas to municipals, utilities, and commercial and industrial customers.
- Shell Gas Direct
- Shell subsidiary supplying natural gas and electricity to industrial and commercial customers in the U.K.
- South Jersey Industries, Inc.
- Natural gas distribution, sales, transportation, and energy management.
- Southern Union Company (2)
- Southwestern Energy Company
- Integrated energy company engaged in oil and gas exploration and production, natural gas gathering, transmission, distribution, and marketing.
- Washington Gas (1)
- Wicor
- Provides natural gas distribution to approx. 521 thousand customers throughout WI, and manufacture and sell pumps and processing equipment used to pump, control, hold and filter water and other fluids.
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