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Area codes 815 and 779

Area codes 815 and 779 are telephone area codes in the North American Numbering Plan (NANP) for most of northern Illinois outside the Quad Cities areas. It also serves the Joliet area and some of Chicago’s western and northwestern suburbs. 815 was one of the four original Illinois area codes assigned in 1947. Area code 779 was added to the same numbering…

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Area codes 815 and 779

Nodes261
Edges260
Triples0
Avg. degree1.99
Density0.007663
Components1

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area code 815 numbering plan illinois codes north american 779 northern new outside one 1947 overlay also joliet created state

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