County Maps US

St. Lucie County, Florida

A county in Florida, ranked 20 of 67 by population.

CountyFIPS 12111

Within Florida
St. Lucie County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Fort Pierce, the county seat, located via the 2025 Census Gazetteer.

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Population
402,449
+70,996 (+21.4%) since 2020
Land area
571.9
square miles. A further 16.9% of the total area is water
Population density
704
people per square mile, computed rather than published
County seat
Fort Pierce
Seat of county government.
Established
1905
120 years ago
Largest city
Port St. Lucie city
Population 268,062.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of St. Lucie County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of St. Lucie County, Florida from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 677 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where St. Lucie County ranks

Position among the 67 counties of Florida, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn FloridaNationally
Population402,44920th of 67189th of 3,144
Land area571.9 sq mi49th of 671,755th of 3,144
Population density704 per sq mi12th of 67214th of 3,144
Median household income$71,45729th of 671,091st of 3,143

Full data for St. Lucie County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population402,449Vintage 2025 Population Estimates
Population in 2020331,453Vintage 2025 Population Estimates
2020 estimates base?329,226Vintage 2025 Population Estimates
Land area571.9 sq mi2025 Gazetteer Files
Water area116.1 sq mi2025 Gazetteer Files
Total area688 sq mi2025 Gazetteer Files
Population density?704 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$71,457American Community Survey 2020-2024 5-Year Estimates
Median home value$347,300American Community Survey 2020-2024 5-Year Estimates
Median age45.1American Community Survey 2020-2024 5-Year Estimates
Households137,453American Community Survey 2020-2024 5-Year Estimates
Housing units160,146American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-280
3,795 births, 4,075 deaths
Net migration
+11,214
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 3 areas bordering St. Lucie County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Martin CountyFlorida38 mi166,272
Indian River CountyFlorida26 mi172,799
Okeechobee CountyFlorida24 mi42,608

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 67 counties of Florida

Open the interactive Florida county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.