St. Lucie County Map, Florida
Explore the definitive interactive map and reference guide to St. Lucie County, Florida. With a population of 329,226 living across 572 square miles of land, St. Lucie County is one of 3 counties in the Treasure Coast region. The county seat is Fort Pierce, and the county carries the FIPS identifier 12111 in U.S. Census and USGS datasets.
One of the fastest-growing counties in the U.S., St. Lucie is anchored by the master-planned community of Port St. Lucie and the historic port of Fort Pierce on the Indian River Lagoon.
St. Lucie County at a glance
A concise reference summary of St. Lucie County's key statistics — useful for research, real estate, relocation, travel planning, GIS workflows, journalism, and civics education.
- Official name
- St. Lucie County
- County seat
- Fort Pierce
- FIPS code
- 12111
- Region
- Treasure Coast
- Established
- 1905
- Named for
- Fort St. Lucie, named for the Catholic saint.
- Land area
- 572 sq mi
- Water area
- 116 sq mi
- Total area
- 688 sq mi
- Population (2020)
- 329,226
- Population density
- 576 / sq mi
- Time zone
- Eastern Time
Where is St. Lucie County, Florida?
St. Lucie County is located in the Treasure Coast region of Florida, one of 67 counties that make up the state. Its county seat, Fort Pierce, 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 688 square miles — 572 of land and 116 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, 12111, in datasets, boundary files, and hazard mapping.
St. Lucie County shares borders with 3 neighboring counties: Indian River County, Okeechobee County, Martin 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.
St. Lucie County geography & landscape
Barrier islands, the Indian River Lagoon, the North and South Forks of the St. Lucie River, and inland citrus groves.
The county's overall footprint — 572 square miles of land plus 116 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.
Economy & industry in St. Lucie County
Health care (Cleveland Clinic Tradition Hospital), construction, retail, professional services, agriculture (citrus), and a growing biotechnology corridor.
Employment, tax base, and land use in St. Lucie County reflect its location in Treasure Coast 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.
History of St. Lucie County
Split from Brevard County in 1905. Fort Pierce was a strategic Second Seminole War fort; the town later grew as a citrus and pineapple port. The 1715 Spanish treasure fleet — source of the 'Treasure Coast' name — wrecked off this coast.
Established in 1905, St. Lucie County is one of Florida's modern 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. Lucie County Historical Commission or equivalent local body.
Tourism & things to do in St. Lucie County
Fort Pierce Inlet State Park, National Navy UDT-SEAL Museum, A.E. Backus Museum, Manatee Observation Center, and the Sunrise Theatre.
Whether you're planning a weekend trip, a longer stay, or a day drive from a neighboring county, St. Lucie County offers a mix of natural, cultural, and community attractions tied to its Treasure Coast 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).
Cities, towns & communities in St. Lucie County
St. Lucie County contains the following incorporated cities, towns, and notable census-designated places. Each municipality provides local services, zoning, and police protection within the broader county jurisdiction. Use the ZIP code lookupto jump between Florida counties instantly.
Getting to St. Lucie County
Access routes and regional transportation infrastructure serving St. Lucie County.
- I-95
- Florida's Turnpike
- US-1
- SR-A1A
- SR-70
- Treasure Coast International (FPR)
St. Lucie County GIS, parcel & boundary data
St. Lucie County's authoritative boundary lines, parcel data, zoning layers, flood zones, and land-use inventories are maintained by county government and state agencies. Use the official links in the sidebar for parcel lookups, appraiser searches, and record requests. For statewide GIS, the Florida Geographic Data Library (FGDL) and the Florida Department of Environmental Protection publish downloadable layers keyed to FIPS 12111.
You can download this county's outline as SVG, PNG, or a printable PDF factsheet using the export tools in the sidebar — perfect for reports, presentations, classroom handouts, or planning documents.
Frequently asked about St. Lucie County
Population figures reflect the U.S. Census Bureau 2020 decennial count with ACS 5-year updates where noted. Land and water areas come from the U.S. Census Bureau TIGER/Line boundary files. Highway designations use Florida Department of Transportation route inventories. County establishment dates and namesakes are drawn from the Florida Association of Counties and State Archives of Florida. See our methodology page.
Nearby Florida counties
Counties that share a border with St. Lucie County. Click any to view its map, seat, cities, and full guide.