| General Information about Area Code 779 | |
|---|---|
| Country | United States |
| State / Province / Territory | Illinois |
| Major City | Rockford |
| Time Zone | Central (UTC-06:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 779-994 | Crystal Lake | Mchenry | Landline |
| 779-703 | Joliet | Will | Wireless |
| 779-226 | Polo | Ogle | Landline |
| 779-706 | Sandwich | Dekalb | Wireless |
| 779-548 | Marengo | Mchenry | Landline |
| 779-804 | Pontiac | Livingston | Landline |
| 779-429 | Wilmington | Will | Landline |
| 779-214 | Galena | Jo Daviess | Landline |
| 779-324 | Frankfort | Will | Landline |
| 779-382 | Genoa | Dekalb | Landline |
| 779-970 | Winnebago | Winnebago | - |
| 779-225 | Joliet | Will | Wireless |
| 779-444 | Wonder Lake | Mchenry | Landline |
| 779-227 | Joliet | Will | Wireless |
| 779-903 | Braidwood | Will | Landline |
| 779-800 | Crystal Lake | Mchenry | Landline |
| 779-206 | Joliet | Will | Wireless |
| 779-901 | Marengo | Mchenry | Landline |
| 779-707 | Joliet | Will | Landline |
| 779-201 | La Salle | La Salle | Wireless |