Oswego City Area Code List
| Area Codes |
Country |
State |
City |
Time Zone |
Operating |
| 315 |
US |
New York - NY |
Oswego |
Eastern |
Details |
| 331 |
US |
Illinois - IL |
Oswego |
Central |
Details |
| 620 |
US |
Kansas - KS |
Oswego |
Central / Mountain |
Details |
| 630 |
US |
Illinois - IL |
Oswego |
Central |
Details |
