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Original numbering plan areas and area codes of Minnesota in 1952. When the American Telephone and Telegraph Company (AT&T) created the first nationwide telephone numbering plan for Operator Toll Dialing in 1947 to automate and speed the connection of long-distance calls, the United States and Canada were divided into 86 geographic numbering plan areas (NPAs) and assigned the original North ...
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]
In August 2022, the North American Numbering Plan Administrator forecasted the exhaust of all available telephone numbers in 507 by 2025. [1] Area code 924 was approved as an all-service overlay to area code 507 by the Minnesota Public Utilities Commission on March 30, 2023. [2] [3] Ten-digit dialing is required as of July 2024. New 924 numbers ...
From 1954 to 1996, 612 covered all of central Minnesota, stretching from border-to-border from Wisconsin to South Dakota. In 1996, nearly all of the 612 territory outside the Twin Cities became area code 320. This was intended as a long-term solution, but within a year, the proliferation of cell phones and pagers brought 612 back to the brink ...
A map of Minnesota area codes. Area code 218 is a telephone area code in the North American Numbering Plan (NANP) for the northern part of the U.S. state of Minnesota.It is assigned to the largest of Minnesota's original two numbering plan areas (NPAs), although its geographical boundaries have been modified since inception.
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A map of Minnesota area codes. Area code 1 is in light brown. Area code 320 is a telephone area code in the North American Numbering Plan for most of the central part of the U.S. state of Minnesota. The numbering plan area (NPA) excludes the Twin Cities metro region.
Minnesota was divided into a south-eastern area including the Twin Cities with area code 612 and the rest of the state in the south-west and north with area code 218. [2] In 1954, the southern half of 612 was designated a separate numbering plan area with area code 507 as the third area code for the state, while 612 was rotated out to cover ...