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Area code 406. 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, there were 1.7 million lines served by 47 carriers; all but ...
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.
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]
0–9. Area code 406. Categories: Communications in Montana. Area codes in the United States by state or territory.
Washington (all of eastern Washington, including Spokane, Ellensburg, Pullman, the Tri-Cities area, Walla Walla, Wenatchee, and Yakima) 1956: split of 206; 510: California (coastal regions of the East Bay: Oakland, Fremont, Hayward, Richmond, Berkeley, and Alameda) September 2, 1991: used until 1981 for TWX service; split of 415; 1998: split to ...
cities, towns, townships, unincorporated communities, Indian reservations, census designated place. This is a list of the counties in the U.S. state of Montana. There are 56 counties in the state. Montana has two consolidated city-counties— Anaconda with Deer Lodge County and Butte with Silver Bow County. The portion of Yellowstone National ...
Telephone dial number card of c.1948 with the local telephone number 4-5876 in Atlantic City, NJ, using the central office prefix 4, later converted to AT4. Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central office prefix, later converted to LA6.
Telephone prefix. A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme. In other countries, both the prefix and the ...