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.