Area code 406

Article summary

Image:Area_code_MT.png|right|thumb|Montana numbering plan area and area code (blue) poly 67 33 0 20 1 1 51 0 58 24 Area code 250 poly 66 33 57 25 52 0 198 0 198 54 Area code 403 poly 198 55 198 0 419 0 418 72 265 63 Area code 306 poly 373 71 419 71 419 212 364 210 Area code 701 poly 364 212 363 267 419 267 419 212 Area code 605 poly 140 233 133 268 363 269 362 255 Area code 307 poly 1 21 15 23 6 70 12 85 12 99 37 137 47 141 36 165 39 178 31 179 32 187 35 195 51 188 58 216 65 222 60 221 61 230 71 230 71 248 77 254 79 247 92 253 93 246 110 250 121 250 125 243 130 256 135 259 134 268 1 267 Area codes 208 and 986 desc top-right Area code 406 is the telephone area code in the North American Numbering Plan for the entire U.S. state of Montana. It has been Montana's only area code since the American Telephone and Telegraph Company created a nationwide telephone numbering plan in 1947. As of 2013, 47 carriers served 1.7 million lines in Montana. All but two wireline providers support local number portability (the exceptions are small rural independents Hot Springs Telephone Company and Northern Telephone Cooperative). Sufficient available codes for new exchanges in the 406 area code exist to meet anticipated demand until 2031; number pooling has been implemented in response to increased demand and inefficient use of 406 numbering resources.…

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