United States of America
- Watertown, a town in Litchfield County, Connecticut
- Watertown, the county seat of Codington County, South Dakota
- Watertown, a city in Middlesex County, Massachusetts
- Watertown, a town in Carver County, Minnesota
- Watertown, county seat of Jefferson County, New York
- Watertown, a town in Wilson County, Tennessee
- Watertown, city located between Dodge County and Jefferson County, Wisconsin