The South Washington Street Historic District is a residential historic district located in Watertown, Wisconsin.

The area which is now the district was platted in the 1860s, and development began in the 1870s.

Jesse Stone, a Lieutenant Governor of Wisconsin, resided at 300 South Washington Street in what is now the district.

The district includes examples of most popular architectural styles of the late nineteenth and early twentieth centuries, including Federal, Italianate, Second Empire, Queen Anne, Craftsman, Colonial Revival, and Georgian Revival.

[2] The district was added to the State and the National Register of Historic Places in 2003.