Lookup › Area code 406
406 Area Code — Billings, Montana
Area code 406 serves Billings, MT.
Most looked-up 406 numbers
- 406-219-1787
- 406-646-6474
- 406-308-7080
- 406-278-1694
- 406-263-4642
- 406-261-7711
- 406-697-8986
- 406-537-9052
- 406-561-1874
- 406-437-0951
Phone prefixes in 406
Carriers serving 406
- Verizon (3 numbers)
- Bandwidth (2 numbers)
- T-Mobile (1 numbers)
- At&t (1 numbers)
- Onvoy Spectrum, LLC (1 numbers)
- Sagebrush Cellular, Inc. (1 numbers)
- Triangle Telephone Cooperative (1 numbers)
Frequently asked questions
Where is area code 406?
Area code 406 serves Billings, MT.
What prefixes are in area code 406?
Phone2.io tracks 10 phone prefixes in area code 406, with carrier and spam-report data on individual numbers.
More about area code 406
Area code 406 overview, history, and local numbers · Get a MT phone number
Last updated: May 11, 2026