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Area code 406
List of North American Numbering Plan area codes
0–9. Area code 406. Categories: Communications in Montana. Area codes in the United States by state.
List of municipalities in Montana
Highway markers for MT 3, MT 59, and MT 200 Map of main highways within Montana System information Maintained by MDT Formed 1942 Highway names Interstates Interstate nn (I-nn) US Highways U.S. Highway n (US n) State Montana Highway n (MT n) Secondary Secondary Highway nnn (S-nnnn) System links Montana Highway System Interstate US State Secondary The state highways in Montana are the state ...
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
List of Pennsylvania area codes
List of country calling codes