| 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 |
|---|---|---|---|
| 815-482 | Wonder Lake | Mchenry | Wireless |
| 815-609 | Plainfield | Will | Landline |
| 815-819 | Orangeville | Stephenson | Landline |
| 815-553 | Joliet | Will | Landline |
| 815-777 | Galena | Jo Daviess | Landline |
| 815-960 | Leaf River | Ogle | Landline |
| 815-376 | Ohio | Bureau | Landline |
| 815-232 | Freeport | Stephenson | Landline |
| 815-488 | Brookfield | Cook | Wireless |
| 815-683 | Crescent City | Iroquois | Landline |
| 815-791 | Joliet | Will | Wireless |
| 815-803 | Byron | Ogle | Landline |
| 815-613 | Mount Carroll | Carroll | Landline |
| 815-900 | Amboy | Lee | Landline |
| 815-606 | Ottawa | La Salle | Landline |
| 815-316 | Rockford | Winnebago | Landline |
| 815-860 | Elwood | Will | Landline |
| 815-678 | Richmond | Mchenry | Landline |
| 815-214 | Kankakee | Kankakee | Landline |
| 815-575 | Woodstock | Mchenry | Wireless |