Bath is a city in Sagadahoc County, Maine, United States. Bath is included in the Brunswick micropolitan. Bath has a 2024 population of 8,870. I…Bath is a city in Sagadahoc County, Maine, United States. Bath is included in the Brunswick micropolitan. Bath has a 2024 population of 8,870. It is also the county seat of Sagadahoc County. Bath is currently 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 on the Fourth of July weekend. It is commonly known as "The City of Ships" because of all the sailing ships that were built in the Bath shipyards. Bath is part of the Portland-South Portland-Biddeford metropolitan statistical area.