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is a city in and the county seat of Door County, Wisconsin, United States. The population was 9,437 at the 2000 census. It is located at the natural end of Sturgeon Bay, although the Sturgeon Bay Ship Canal was built across the remainder of the Door Peninsula.
According to the United States Census Bureau, the city has a total area of 11.3 square miles (29.3 km²), of which, 9.6 square miles (24.9 km²) of it is land and 1.7 square miles (4.4 km²) of it (14.94%) is water.