Format:Area code MT

Prefixul telefonic al statului american Montana este 406.

Format de navigare al prefixelor telefonice tuturor diviziunilor politice ale Statelor Unite ale Americii

Prefixe telefonice SUA	Alabama \| Alaska \| Arizona \| Arkansas \| California \| Colorado \| Connecticut \| Delaware \| Florida \| Georgia \| Hawaii \| Idaho \| Illinois \| Indiana \| Iowa \| Kansas \| Kentucky \| Louisiana \| Maine \| Maryland \| Massachusetts \| Michigan \| Minnesota \| Mississippi \| Missouri \| Montana \| Nebraska \| Nevada \| New Hampshire \| New Jersey \| New Mexico \| New York \| North Carolina \| North Dakota \| Ohio \| Oklahoma \| Oregon \| Pennsylvania \| Rhode Island \| South Carolina \| South Dakota \| Tennessee \| Texas \| Utah \| Vermont \| Virginia \| Washington \| West Virginia \| Wisconsin \| Wyoming \|
District federal	Districtul Columbia
Zone insulare

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