Martin County Map, Florida
Explore the definitive interactive map and reference guide to Martin County, Florida. With a population of 158,431 living across 543 square miles of land, Martin County is one of 3 counties in the Treasure Coast region. The county seat is Stuart, and the county carries the FIPS identifier 12085 in U.S. Census and USGS datasets.
A coastal Treasure Coast county at the confluence of the St. Lucie River and the Indian River Lagoon, Martin is known for the sailfish fishery off Stuart and for four-story residential building height limits that preserved coastal character.
Martin County at a glance
A concise reference summary of Martin County's key statistics — useful for research, real estate, relocation, travel planning, GIS workflows, journalism, and civics education.
- Official name
- Martin County
- County seat
- Stuart
- FIPS code
- 12085
- Region
- Treasure Coast
- Established
- 1925
- Named for
- John W. Martin, Florida governor 1925-1929.
- Land area
- 543 sq mi
- Water area
- 187 sq mi
- Total area
- 730 sq mi
- Population (2020)
- 158,431
- Population density
- 292 / sq mi
- Time zone
- Eastern Time
Where is Martin County, Florida?
Martin County is located in the Treasure Coast region of Florida, one of 67 counties that make up the state. Its county seat, Stuart, 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 730 square miles — 543 of land and 187 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, 12085, in datasets, boundary files, and hazard mapping.
Martin County shares borders with 3 neighboring counties: St. Lucie County, Okeechobee County, Palm Beach 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.
Martin County geography & landscape
St. Lucie River, Indian River Lagoon, St. Lucie Inlet, and inland scrub. Jonathan Dickinson State Park protects rare sand-pine scrub.
The county's overall footprint — 543 square miles of land plus 187 square miles of water — places it among the more compact 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 Martin County
Boating and marine industries, tourism, health care, agriculture (citrus, sugarcane in the western Indiantown area), and retirees.
Employment, tax base, and land use in Martin 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 Martin County
Split from Palm Beach County in 1925. Stuart's Roosevelt Bridge, St. Lucie River, and Sailfish Capital branding all trace to the 20th-century boom.
Established in 1925, Martin 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 Martin County Historical Commission or equivalent local body.
Tourism & things to do in Martin County
Stuart's Downtown, Jonathan Dickinson State Park, House of Refuge Museum, Blowing Rocks Preserve (Hobe Sound), and Hutchinson Island beaches.
Whether you're planning a weekend trip, a longer stay, or a day drive from a neighboring county, Martin 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 Martin County
Martin 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 Martin County
Access routes and regional transportation infrastructure serving Martin County.
- I-95
- Florida's Turnpike
- US-1
- SR-A1A
- SR-76
- Witham Field (SUA)
Martin County GIS, parcel & boundary data
Martin 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 12085.
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 Martin 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 Martin County. Click any to view its map, seat, cities, and full guide.