| County | County Seat | Established | County Origins | Named For | Host | Location of County on Map |
|---|---|---|---|---|---|---|
| Alachua | Gainesville | 1824 | St Johns County | Derived from the name of a chasm located northwest of Gainesville |
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| Baker | Macclenny | 1861 | Bradford County | James McNair Baker (1821–1892), a Confederate senator and later a judge in the fourth judicial district |
Adoptable |
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| Bay | Panama City | 1913 | Washington County | St. Andrew's Bay, the central geographic feature of the county |
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| Bradford | Starke | 1858 | Columbia and Alachua counties | Richard Bradford, the first officer from Florida to die in the Civil War; he was killed during the Battle of Santa Rosa Island | ADOPTABLE |
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| Brevard | Titusville | 1844 | Orange County | Thomas Washington Brevard, state comptroller from 1853 to 1861 | ADOPTABLE |
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| Broward | Fort Lauderdale | 1915 | Miami-Dade County | Napoleon Bonaparte Broward (1857–1910), 19th Governor of Florida from 1905 to 1909 | ADOPTABLE |
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| Calhoun | Blountstown | 1838 | Escambia County. | John C. Calhoun (1782–1850) leading Southern politician from South Carolina | ADOPTABLE |
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| Charlotte | Punta Gorda | 1921 | De Soto County. | Probably a corruption of the name of the Calusa, a group of Native Americans from the area | ADOPTABLE |
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| Citrus | Iverness | 1887 | Hernando County. | The county's citrus trees | ADOPTABLE |
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| Clay | Green Cove Springs | 1858 | Duval County. | Henry Clay (1777–1852), Secretary of State from 1825 to 1829 under John Quincy Adams | Jim Albro |
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| Collier | Naples | 1923 | Lee County. | Barron Collier (1873–1939), an advertising entrepreneur who developed much of the land in southern Florida | ADOPTABLE |
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| Columbia | Lake City | 1832 | St Johns County | Christopher Columbus (c. 1451–1506), explorer of the Americas | ADOPTABLE |
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| DeSoto | Arcadia | 1887 | Manatee County | Hernando de Soto (c. 1496/1497–1542), a Spanish explorer and conquistador | ADOPTABLE |
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| Dixie | Cross City | 1921 | Lafayette County | Dixie is a common nickname for the Southern United States | ADOPTABLE |
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| Duval | Jacksonville | 1822 | St Johns County | William Pope Duval (1784–1854), the first governor of the Florida Territory | Jim Albro |
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| Escambia | Pensacola | 1821 | One of the two original counties of Florida | Most likely taken from a Native American word | ADOPTABLE |
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| Flagler | Bunnell | 1917 | St. Johns and Volusia counties | Henry Morrison Flagler (1830–1913), founder of the Florida East Coast Railway | ADOPTABLE |
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| Franklin | Apalachicola | 1832 | Escambia County | Benjamin Franklin (1706–1790), one of the Founding Fathers of the United States of America | ADOPTABLE |
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| Gadsden | Quincy | 1823 | Jackson County | James Gadsden (1788–1858), American diplomat and namesake of the Gadsden Purchase | ADOPTABLE |
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| Gilchrist | Trenton | 1925 | Alachua County | Albert W. Gilchrist (1858–1926), the 20th Governor of Florida | ADOPTABLE |
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| Glades | Moore Haven | 1921 | DeSoto County | The Florida Everglades | ADOPTABLE |
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| Gulf | Port St Joe | 1925 | Calhoun | The Gulf of Mexico | ADOPTABLE |
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| Hamilton | Jasper | 1827 | Escambia County | Alexander Hamilton (1757–1804), the first United States Secretary of the Treasury and a Founding Father | ADOPTABLE |
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| Hardee | Wauchula | 1921 | DeSoto County | Cary A. Hardee (1876–1957), governor of Florida at the time of creation of Hardee County | ADOPTABLE |
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| Hendry | La Belle | 1923 | Lee County | Francis A. Hendry (1833–1917), early Floridian pioneer and politician | ADOPTABLE |
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| Hernando | Brooksville | 1843 | Hillsborough, Mosquito, and Alachua counties | Hernando de Soto (c.1496/1497–1542), a Spanish explorer and conquistador | ADOPTABLE |
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| Highlands | Sebring | 1921 | DeSoto County | Named for the county's hilly terrain | ADOPTABLE |
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| Hillsborough | Tampa | 1834 | St Johns County | Wills Hill, 1st Marquess of Downshire (1718–1793), former Secretary of State of the American Colonies | ADOPTABLE |
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| Holmes | Bonifay | 1848 | Jackson and Walton counties | Holmes Creek, which forms the eastern boundary of the county | ADOPTABLE |
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| Indian River | Vero Beach | 1925 | St Lucie County | The Indian River Lagoon, which flows through the county | ADOPTABLE |
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| Jackson | Marianna | 1822 | Escambia County | Andrew Jackson (1767–1845), the seventh President of the United States | ADOPTABLE |
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| Jefferson | Monticello | 1827 | Escambia County | Thomas Jefferson (1743–1826), the third President of the United States and principal author of the Declaration of Independence | ADOPTABLE |
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| Lafayette | Mayo | 1856 | Madison County | Marquis de Lafayette (1757–1834), French aristocrat and general in the American Revolutionary War | ADOPTABLE |
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| Lake | Tavares | 1887 | Orange and Sumter counties | Named for the many lakes in the region | ADOPTABLE |
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| Lee | Fort Myers | 1887 | Monroe County | Robert E. Lee (1807–1870), commander of the Confederate Army of Northern Virginia in the American Civil War | ADOPTABLE |
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| Leon | Tallahassee | 1824 | Escambia County | Juan Ponce de León (1474–1521), Spanish explorer who named Florida | ADOPTABLE |
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| Levy | Bronson | 1845 | Alachua County | David Levy Yulee (1810–1886), one of the state's original United States Senators | ADOPTABLE |
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| Liberty | Bristol | 1855 | Gadsden County | The patriotic ideal of liberty | ADOPTABLE |
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| Madison | Madison | 1827 | Jefferson County | James Madison (1751–1836), fourth President of the United States | ADOPTABLE |
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| Manatee | Bradenton | 1855 | Hillsborough and Orange counties | The Manatee, or sea cow, is native to Floridian waters | ADOPTABLE |
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| Marion | Ocala | 1844 | Alachua and Orange counties | Francis Marion (c. 1732–1795), military officer during the American Revolution | ADOPTABLE |
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| Martin | Stuart | 1925 | Saint Lucie and Palm Beach counties | John W. Martin (1884–1958), governor of Florida at time of creation of the county | ADOPTABLE |
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| Miami-Dade | Miami | 1836 | St Johns County | City of Miami and Francis L. Dade (c. 1793–1835), Major in the United States Army during the Second Seminole War | ADOPTABLE |
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| Monroe | Key West | 1823 | St Johns County | James Monroe (1758–1831), fifth President of the United States |
Pending |
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| Nassau | Fernandina Beach | 1824 | St Johns County | Duchy of Nassau in Germany | ADOPTABLE |
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| Okaloosa | Crestview | 1915 | Santa Rosa and Walton counties | A native word meaning "a pleasant place," "black water", or "beautiful place" | ADOPTABLE |
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| Okeechobee | Okeechobee | 1917 | Osceola and Brevard counties | Lake Okeechobee, which was in turn is from the Hitchiti words for "big water" | ADOPTABLE |
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| Orange | Orlando | 1824 | St Johns County | The fruit that is the county's main product | ADOPTABLE |
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| Osceola | Kissimmee | 1887 | Brevard and Orange counties | Osceola (1804–1838), a leader of the Seminole during the Second Seminole War | ADOPTABLE |
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| Palm Beach | West Palm Beach | 1909 | Miami-Dade County | The county's large amounts of palm trees | ADOPTABLE |
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| Pasco | Dade City | 1887 | Hernando County | Samuel Pasco (1834–1917), United States Senator at the time of creation of the county | ADOPTABLE |
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| Pinellas | Clearwater | 1911 | Hillsborough County | From the Spanish Punta Piñal, or "Point of Pines" | ADOPTABLE |
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| Polk | Bartow | 1861 | Brevard and Hillsborough counties | James K. Polk (1795–1849), the 11th President of the United States | ADOPTABLE |
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| Putnam | Palatka | 1849 | Alachua and St. Johns counties | Benjamin A. Putnam (1801–1869), soldier during the Second Seminole War and Floridian legislator | ADOPTABLE |
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| Saint Johns | Saint Augustine | 1821 | One of the two original counties | Name derived from the St. Johns River, which in turn derives its name from San Juan del Puerto | ADOPTABLE |
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| Saint Lucie | Fort Pierce | 1905 | Brevard County | Saint Lucy (283–304), the Christian martyr | ADOPTABLE |
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| Santa Rosa | Milton | 1842 | Escambia County | Santa Rosa Island, which is in turn named for Saint Rosa de Viterbo (1235–1252), a saint born in Viterbo, Italy | ADOPTABLE |
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| Sarasota | Sarasota | 1921 | Manatee County | Likely taken from a Native American language | ADOPTABLE |
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| Seminole | Sanford | 1913 | Orange County | The Seminole Native American tribe | ADOPTABLE |
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| Sumter | Bushnell | 1853 | Orange County | Thomas Sumter (1734–1832), general in the American Revolution | ADOPTABLE |
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| Suwannee | Live Oak | 1858 | Columbia County | The Suwannee River, a 266 mile long river in northern Florida | ADOPTABLE |
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| Taylor | Perry | 1856 | Madison County | Zachary Taylor (1784–1850), 12th President of the United States | ADOPTABLE |
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| Union | Lake Butler | 1921 | Bradford County | Named for the area's residents united desire to split into a separate county | ADOPTABLE |
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| Volusia | De Land | 1854 | Orange County | The port of Volusia, whose etymology is unknown | ADOPTABLE |
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| Wakulla | Crawfordville | 1843 | Leon County | The Wakulla River, itself named for a Spanish corruption of a Timucuan word of unknown origin | ADOPTABLE |
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| Walton | DeFuniak | 1824 | Escambia Lafayette County | George Walton, first Secretary of Florida Territory | ADOPTABLE |
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| Washington | Chipley | 1825 | Jackson and Walton counties | George Washington (1732–1799), first President of the United States | ADOPTABLE |
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