Cambridge Historic District, Wards I and III is a national historic district in Cambridge, Dorchester County, Maryland. It is a large residential, commercial, and governmental area in the northwest section of the city. It consists of buildings from the late 18th through the mid 20th century. Residential building styles include Georgian, Queen Anne, Colonial Revival, and American Foursquare. The district includes the Italian Villa style courthouse designed by Richard Upjohn. It was added to the National Register of Historic Places in 1990.