Bath is a city in and county seat of Sagadahoc County, Maine, United States. Bath had a 2024 population of 8,870. Bath is growing at a rate of 0.29% annually, and its population has increased by 1.21% since the most recent census, which recorded a population of 8,764 in 2020. 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 during the Fourth of July weekend. It is commonly known as the "City of Ships" due to the number of sailing ships that were built in the Bath shipyards. Bath is part of the Portland-South Portland-Biddeford metropolitan statistical area.