Clearwater is a city located in Pinellas County, Florida, United States, northwest of Tampa and St. Petersburg. To the west of Clearwater lies the Gulf of Mexico and to the southeast lies Tampa Bay. As of the 2020 census, the city had a population of 117,292. Clearwater is the county seat of Pinellas County and is the smallest of the three principal cities in the Tampa–St. Petersburg–Clearwater metropolitan area, most commonly referred to as the Tampa Bay Area. Cleveland Street is one of the city's historic avenues, and the city includes BayCare Ballpark and Coachman Park. The city is separated by the Intracoastal Waterway from Clearwater Beach. Clearwater is the home of Clearwater Marine Aquarium. The global headquarters of the Church of Scientology is located in Clearwater. History Present-day Clearwater was originally the home of the Tocobaga people. Around 1835, the United States Army began construction of Fort Harrison, named after William Henry Harrison, as an outpost during the Seminole Wars. The fort was located on a bluff overlooking Clearwater Harbor, which later became part of an early 20th-century residential development called Harbor Oaks. University of South Florida archaeologists excavated the site in 1962 after Mark Wyllie discovered an underground ammunition bunker while planting a tree in his yard. The area's population grew after the Federal Armed Occupation Act of 1842 offered to anyone who would bear arms and cultivate the land. Early settlers included the Stevens, Stevenson, Sever and McMullen families, who claimed and farmed large tracts of land. Prior to 1906, the area was known as Clear Water Harbor. The name "Clear Water" is thought to have come from a fresh water spring flowing from near where the City Hall building is located today. There were many other freshwater springs that dotted the bluff, many in the bay or harbor itself. Originally part of Hillsborough County, the first road joining Clearwater and Tampa was built in 1849, which dramatically reduced the prior day-long commute between the cities. During the American Civil War, Union gunboats repeatedly raided the community's supplies, as most of the able-bodied men were away fighting for the Confederate Army. The town began developing in the late nineteenth century, prompted by Peter Demens' completion of the first passenger railroad line into the city in 1888. Clearwater was incorporated in 1891, with James E. Crane becoming the first mayor. The area's popularity as a vacation destination grew