Area code 815 covers northern Illinois outside the Chicago metro area, including cities like Rockford, DeKalb, and Joliet. Introduced in 1947, it has served as a key part of Illinois’s telecommunication structure for decades. The code is now overlaid by 779, requiring ten-digit dialing. The region includes manufacturing hubs, college towns, and growing suburbs. 815 is emblematic of traditional Midwestern values—hard work, resilience, and small-town community—and remains a familiar and respected code across northern Illinois.
Locations for Area Code - 815
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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