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Area code 312
List of Illinois area codes
Fish or cut bait
Chicago Heights lies on the high land of the Tinley Moraine, with the higher and older Valparaiso Moraine lying just to the south of the city.. According to the 2021 census gazetteer files, Chicago Heights has a total area of 10.30 square miles (26.68 km 2), of which 10.28 square miles (26.63 km 2) (or 99.87%) is land and 0.01 square miles (0.03 km 2) (or 0.13%) is water.
Area code 872. Coordinates: 41°52′48″N 87°37′54″W. All NPAs within Illinois. Area code 872 is a telephone area code in the North American Numbering Plan for Chicago in the U.S. state of Illinois. It is an overlay code for a numbering plan area that comprises those of area codes 312 and 773. The overlay commenced service on November 7 ...
Telephone prefix
Area code 708 was created on November 11, 1989, in a split of area code 312. It once served almost all of Chicago's suburbs in Illinois. In 1996, its numbering plan area was reduced in a three-way area code split. The northern suburbs received area code 847, while the western suburbs were assigned area code 630.
It was the only new area code created in Illinois between 1947 and the 1989 creation of area code 708. On October 24, 2021, area code 309 was transitioned to ten-digit dialing, despite not being part of an overlay complex, in which multiple area codes are assigned to a numbering plan area. The area code had telephone numbers assigned for the ...