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

Phone prefixes in 406

• 406-219
• 406-646
• 406-308

Carriers serving 406

• Bandwidth (2 numbers)
• Onvoy Spectrum, LLC (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 3 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