| 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 |
|---|---|---|---|
| 815-980 | Rockford | Winnebago | Wireless |
| 815-757 | Dekalb | Dekalb | Wireless |
| 815-400 | Morrison | Whiteside | Landline |
| 815-435 | Beaverville | Iroquois | Landline |
| 815-405 | Joliet | Will | Wireless |
| 815-889 | Milford | Iroquois | Landline |
| 815-273 | Savanna | Carroll | Landline |
| 815-420 | Rochelle | Ogle | Landline |
| 815-644 | Crescent City | Iroquois | Landline |
| 815-737 | Harvard | Mchenry | Landline |
| 815-432 | Watseka | Iroquois | Landline |
| 815-614 | Kankakee | Kankakee | Landline |
| 815-790 | Wonder Lake | Mchenry | Wireless |
| 815-500 | Marseilles | La Salle | Landline |
| 815-396 | Steward | Lee | Landline |
| 815-452 | Wenona | Marshall | Landline |
| 815-676 | Plainfield | Will | Landline |
| 815-888 | Rochelle | Ogle | Landline |
| 815-569 | Capron | Boone | Landline |
| 815-990 | Freeport | Stephenson | Wireless |