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is a city in and the county seat of Codington County, South Dakota, United States. The population was 20,237 at the 2000 census. It is also the principal city of the Watertown Micropolitan Statistical Area, which includes all of Codington and Hamlin counties. Paul S. Fox is the current Mayor. Watertown has one public high school, Watertown High School, and one private boarding school, Great Plains Lutheran High School.
Watertown is home to the Redlin Art Center which houses many of the original art works produced by Terry Redlin, one of America's most popular wildlife artists. Watertown also is home to the Bramble Park Zoo. The
According to the United States Census Bureau, the city has a total area of 23.1 square miles (59.8 km²), of which, 15.2 square miles (39.4 km²) of it is land and 7.9 square miles (20.4 km²) of it (34.04%) is water. Watertown sits on the Big Sioux River and two major lakes, Lake Pelican and Lake Kampeska. Most of Watertown also sits upon a short plateau. Elevation at Watertown Regional Airport is 1,745 feet.
Watertown has been assigned the ZIP code 57201 and the FIPS place code 69300.