Area Code
Montana, United States
Local Time
11:00 PM
Mountain Time
Area Code
406
State / Province
Montana
Country
United States
Time Zone
Mountain Time
Area code 406 covers 260 rate centers across Montana. Rate centers are geographic areas used by telephone companies to determine local calling boundaries.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+14065550100">+14065550100</a><a href="tel:+14065550199">+14065550199</a>Area code 406 is a North American Numbering Plan (NANP) telephone area code assigned to Montana, United States. It is the sole area code assigned to Montana, covering the entire state or province under a single numbering plan area.
Yes. 406 is an active North American Numbering Plan (NANP) area code, currently assigned to Montana, United States. It is safe to answer or dial calls using this area code.
Area code 406 covers 260 rate centers across Montana. Communities served include Absarokee, Alberton, Alta, Alzada, Anaconda, and 255 more localities. Rate centers are the geographic building blocks telephone carriers use to determine local calling boundaries and to assign numbers when a business or individual requests a phone number in a specific city.
All numbers in the 406 area code observe Mountain Time (IANA timezone: America/Denver). Mountain Time is UTC−7 in winter (MST) and UTC−6 in summer (MDT). When placing a call to a 406 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within Montana, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 406 + 7-digit number for long-distance calls within North America. From outside the US or Canada, dial your country's international exit code followed by 1 406 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 406 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +14065550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.