Prefix Information

The prefix 400 is part of area code 406 serving Billings, Montana.

This exchange contains 10,000 possible phone numbers (406-400-0000 through 406-400-9999).

Browse Numbers in This Prefix

406-400-0000-0999 406-400-1000-1999 406-400-2000-2999 406-400-3000-3999 406-400-4000-4999 406-400-5000-5999 406-400-6000-6999 406-400-7000-7999 406-400-8000-8999 406-400-9000-9999

Sample Numbers

(406) 400-0000 (406) 400-1234 (406) 400-2000 (406) 400-3333 (406) 400-4444 (406) 400-5555 (406) 400-6000 (406) 400-7777 (406) 400-8888 (406) 400-9999