St. Johns County Map, Florida

St. Johns County is located in the Northeast Florida region of Florida, one of 67 counties that make up the state. Its county seat, St. Augustine, is the administrative hub — home to the courthouse, county commission chambers, tax collector, property appraiser, supervisor of elections, and clerk of the circuit court.

The county spans a total of 821 square miles — 601 of land and 220 of water — and operates on Eastern Time. Federal agencies including the U.S. Census Bureau, USGS, and FEMA reference the county by its FIPS code, 12109, in datasets, boundary files, and hazard mapping.

St. Johns County shares borders with 4 neighboring counties: Duval County, Clay County, Putnam County, Flagler County. Use the interactive map above to explore where those boundaries meet or jump directly to any neighboring county page for a side-by-side comparison.

Barrier islands (Anastasia Island), coastal marsh, the Matanzas and Tolomato Rivers (Intracoastal Waterway), and the northern Ocklawaha and St. Johns basins inland.

The county's overall footprint — 601 square miles of land plus 220 square miles of water — places it in the mid-range of Florida's 67 counties by area. Elevation across most of Florida is modest, and land-use, drainage basins, and habitat corridors defined by state and federal agencies (Florida Department of Environmental Protection, U.S. Fish & Wildlife Service, and the Water Management Districts) shape how growth and conservation coexist here.

Tourism (heritage tourism to St. Augustine), professional services (Ponte Vedra's PGA Tour headquarters and Northrop Grumman), health care (Flagler Health+), and rapid residential growth in the Nocatee master-planned community.

Employment, tax base, and land use in St. Johns County reflect its location in Northeast Florida and its position in the state's middle tier of population. Economic development authorities, chambers of commerce, and the Florida Department of Economic Opportunity publish updated employer and workforce data for the county on their portals.

One of two original Territorial counties (1821). St. Augustine's Spanish colonial fortifications, mission structures, and Flagler-era Gilded Age hotels shape the city's fabric.

Established in 1821, St. Johns County is one of Florida's earliest counties. Its boundaries, seat, and government have evolved through territorial, statehood, Reconstruction, and modern eras — a lineage documented by the Florida Historical Society, the State Archives of Florida, and the St. Johns County Historical Commission or equivalent local body.

Castillo de San Marcos, St. George Street, St. Augustine Lighthouse, Fort Matanzas, TPC Sawgrass (home of THE PLAYERS Championship), Ponte Vedra beaches, and Anastasia State Park.

Whether you're planning a weekend trip, a longer stay, or a day drive from a neighboring county, St. Johns County offers a mix of natural, cultural, and community attractions tied to its Northeast Florida identity. For the latest hours, admission fees, and seasonal events, check the county's official tourism development council and the Florida State Parks portal (floridastateparks.org).