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 set up in 1947.

2025年3月1日 · Area Code 779 is located in Illinois. It covers 125 cities, including Joliet, Rockford, Plainfield, Dekalb, and Crystal Lake. It also covers 23 counties, including Winnebago County, Will County, McHenry County, Dekalb County, and Kankakee County. A full list of covered cities and counties is below including its prefix and population coverage.

2011年1月18日 · Area code 779 serves the state of Illinois. This area code was assigned on February 6th, 2004. On March 17th, 2007 it went into service. 779 is a General Purpose Code. 779 service area does overlap with 815 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.

2007年3月17日 · Illinois - Area code 779 is currently assigned for use in Illinois since March 17, 2007. This area code originated from the 815 area code previously by means of area code split or overlay. View all phone prefixes used in area code 779 or other area codes in Illinois .

Area code 779 is located in Illinois. Get the area’s map, cities covered, current time, prefixes, and dialing instructions.

779 is an area code located in the state of Illinois, US. The largest city it serves is Rockford. Find out where 779 area code zone from, which states, counties and cities it covers. Get the most exact information on time zones here.

Get information and map of 779 area code, Illinois which shows the counties covered in it. Also get the county list which belongs to area code 779.

Area code 779 - Illinois. Reverse phone lookup, search by area code or region. Local time and map of Illinois

The 779 Area Code is located in the state of Illinois. Area Code 779 is one of the 269 three-digit telephone area codes in the USA. It covers roughly 2,899,978 unique phone numbers and 876,433 individuals near the cities of Rockford, Joliet, and Dekalb.

Lookup information on Area Code 779 - get demographic, NPA NXX, and other data by area code