Williams City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 515 | US | Iowa - IA | Williams | Central | Details |
| 530 | US | California - CA | Williams | Pacific | Details |
| 541 | US | Oregon - OR | Williams | Mountain / Pacific | Details |
| 812 | US | Indiana - IN | Williams | Eastern / Central | Details |
| 928 | US | Arizona - AZ | Williams | (UTC-7) | Details |