thumb|right|250px|Population by county:
thumb|Florida counties 1820-1936
There are 67 counties in the U.S. state of Florida, which became a territory of the U.S. in 1821 with two counties complementing the provincial divisions retained as a Spanish territory, Escambia to the west and St. Johns to the east. The two counties were divided by the Suwannee River. All of the other counties were created later from these two original counties. Florida became the 27th U.S. state in 1845, and its last county was created in 1925 with the formation of Gilchrist County from a segment of Alachua County. Florida's counties are subdivisions of the state government. Florida's most populous county is Miami-Dade County, the seventh most populous county in the nation, with a population of 2,701,767 as of the 2020 census.
In 1968, counties gained the power to develop their own charters. All but two of Florida's county seats are incorporated municipalities: the exceptions are Crawfordville, county seat of rural Wakulla County, and East Naples, located outside Naples city limits in Collier County.
The names of Florida's counties reflect its cultural heritage. Some are named for Confederate political leaders and Spanish explorers, marking the influence of Spanish sovereignty, while others are named for Christian saints, Native American sites, as well as political leaders of the United States. Natural features of the region, including rivers, lakes and flora, are also commonly used for county names. Florida has counties named for participants on both sides of the Second Seminole War: Miami-Dade County is partially named for Francis L. Dade, a major in the U.S. Army at the time; Osceola County is named for the war's native Muscogee-Seminole resistance leader Osceola.
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