Bath is a city in Sagadahoc County, Maine, in the United States. As of the 2000 census, the city population was 9,266. It is the county seat of Sagadahoc County. Located on the Kennebec River, Bath is a port of entry with a good harbor. The city is popular with tourists, many drawn by its 19th-century architecture. It is home to the Bath Iron Works and Heritage Days Festival, held annually on the Fourth of July weekend.