Southwest Gas Headquarters HQ Office Address: Southwest Gas Corporate HQ Address: 10851 N Black Canyon Hwy, Phoenix, AZ, 85029-4755, United States. Southwest Gas Corporate HQ Phone Number: (602) 861-1999. Southwest Gas Corporate HQ Fax Number: (602) 395-4002.Who is Southwest Gas Corporation?
Southwest Gas Corporation History. Southwest Gas Corporation was founded in 1931 in Barstow, California. The company expanded to Nevada in 1953. Today Southwest Gas is the largest supplier of natural gas in Arizona and Nevada with 1.93 million customers, as well as some presence in California.