Southwest Gas Corporation engages in the purchase, distribution, and transportation of natural gas in Arizona, Nevada, and California. The company operates in two segments, natural gas operations and construction services. As of February 27, 2013, it had approximately 1.9 million residential, commercial, and industrial natural gas customers. The company also operates as an underground piping contractor that provides trenching and installation, replacement, and maintenance services for energy distribution systems to utility companies. Southwest Gas Corporation was founded in 1931 and is headquartered in Las Vegas, Nevada.