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Area code 406
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 municipalities in Montana
Lists of United States area codes This page was last edited on 10 April 2015, at 20:25 (UTC) . Text is available under the Creative Commons Attribution-ShareAlike License 4.0 ; additional terms may apply.
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.
Name of place Number of counties Principal county ZIP code Lower Upper Babb: 1 Glacier County: 59411 Bainville: 1 Roosevelt County: 59212 Baker: 1 Fallon County: 59313 Ballantine: 1 Yellowstone County: 59006 Bannack: 1 Beaverhead County: Basin: 1 Jefferson County: 59631 Bearcreek: 1 Carbon County: 59007 Belfry: 1 Carbon County: 59008 Belgrade ...
Telephone prefix