Watertown City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 315 | US | New York - NY | Watertown | Eastern | Details |
| 605 | US | South Dakota - SD | Watertown | Central / Mountain | Details |
| 615 | US | Tennessee - TN | Watertown | Central | Details |
| 617 | US | Massachusetts - MA | Watertown | Eastern | Details |
| 860 | US | Connecticut - CT | Watertown | Eastern | Details |
| 920 | US | Wisconsin - WI | Watertown | Central | Details |
| 952 | US | Minnesota - MN | Watertown | Central | Details |