| General Information about Area Code 815 | |
|---|---|
| Country | United States |
| State / Province / Territory | Illinois |
| Major City | Rockford |
| Time Zone | Central (UTC-06:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 815-484 | Rockford | Winnebago | Landline |
| 815-248 | Durand | Winnebago | Landline |
| 815-741 | Joliet | Will | Landline |
| 815-365 | Reddick | Kankakee | Landline |
| 815-216 | Bradley | Kankakee | Wireless |
| 815-682 | Wellington | Iroquois | Landline |
| 815-551 | Savanna | Carroll | Landline |
| 815-969 | Rockford | Winnebago | Landline |
| 815-836 | Romeoville | Will | Landline |
| 815-563 | Freeport | Stephenson | Landline |
| 815-904 | Rockford | Winnebago | Wireless |
| 815-388 | Mchenry | Mchenry | Landline |
| 815-222 | Rockford | Winnebago | Wireless |
| 815-827 | Maple Park | Kane | Landline |
| 815-739 | Sycamore | Dekalb | Wireless |
| 815-215 | New Lenox | Will | Landline |
| 815-721 | Rockford | Winnebago | Landline |
| 815-295 | Kankakee | Kankakee | Landline |
| 815-401 | Kankakee | Kankakee | Landline |
| 815-323 | Belvidere | Boone | Landline |