Here in the Las Vegas area the local natural gas company is Southwest Gas.
Their Las Vegas area offices are located at:
6040 Badura Ave, Suite 110
Las Vegas, NV 89118
Located in the Beltway Business Park (adjacent to Starbucks and Port of Subs)
North Las Vegas
1374 W. Cheyenne # 107
North Las Vegas, NV 89030
Customer Service Phone Number:
Emergency Number (if you smell gas) 1-800-447-5422
The following link will take you to Southwest Gas' Web Site.
You can also start, stop or move service online.