Area code 779 is an overlay of 815, serving northern Illinois outside the Chicago metro, including cities like Rockford, Joliet, DeKalb, and Ottawa. Introduced in 2007, the region combines industrial cities, farmlands, and university towns. It’s home to manufacturing, logistics, and a growing suburban population extending from Chicago. Ten-digit dialing is required. While 815 holds more historical recognition, 779 plays a crucial role in accommodating new growth in this large and diverse region of Illinois.
Locations for Area Code - 779
Browse all cities and areas that belong to this area code.
Belvidere
- State: IL
- Population: 25,132
- Latitude: 42.26391, Longitude: -88.84427
- Elevation: 238 m
Crystal Lake
- State: IL
- Population: 40,448
- Latitude: 42.24113, Longitude: -88.3162
- Elevation: 279 m
DeKalb
- State: IL
- Population: 43,211
- Latitude: 41.92947, Longitude: -88.75036
- Elevation: 268 m
Freeport
- State: IL
- Population: 24,476
- Latitude: 42.29669, Longitude: -89.62123
- Elevation: 237 m
Joliet
- State: IL
- Population: 147,861
- Latitude: 41.52519, Longitude: -88.0834
- Elevation: 165 m
Kankakee
- State: IL
- Population: 26,676
- Latitude: 41.12003, Longitude: -87.86115
- Elevation: 200 m
Loves Park
- State: IL
- Population: 23,455
- Latitude: 42.32002, Longitude: -89.05816
- Elevation: 222 m
Machesney Park
- State: IL
- Population: 22,927
- Latitude: 42.34724, Longitude: -89.039
- Elevation: 226 m
McHenry
- State: IL
- Population: 40,448
- Latitude: 42.24113, Longitude: -88.3162
- Elevation: 279 m
Rockford
- State: IL
- Population: 148,278
- Latitude: 42.27113, Longitude: -89.094
- Elevation: 218 m
Romeoville
- State: IL
- Population: 39,719
- Latitude: 41.64753, Longitude: -88.08951
- Elevation: 189 m
Woodstock
- State: IL
- Population: 25,189
- Latitude: 42.31474, Longitude: -88.4487
- Elevation: 288 m
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