Prefix Information

The prefix 840 is part of area code 406 serving Billings, Montana.

This exchange contains 10,000 possible phone numbers (406-840-0000 through 406-840-9999).

Browse Numbers in This Prefix

406-840-0000-0999 406-840-1000-1999 406-840-2000-2999 406-840-3000-3999 406-840-4000-4999 406-840-5000-5999 406-840-6000-6999 406-840-7000-7999 406-840-8000-8999 406-840-9000-9999

Sample Numbers

(406) 840-0000 (406) 840-1234 (406) 840-2000 (406) 840-3333 (406) 840-4444 (406) 840-5555 (406) 840-6000 (406) 840-7777 (406) 840-8888 (406) 840-9999