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Area code 406
Toll-free telephone numbers in the North American ...
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 ZIP Code prefixes
Area codes 973 and 862
Telephone prefix
Area codes 916 and 279
Area codes 208 and 986