St. Lucie County, Florida
County seat: Fort Pierce · Population 402,449 (2025) · 572 sq mi
St. Lucie County is the 20th most populous of Florida's 67 counties, with 402,449 people (2025 estimate). Its county seat is Fort Pierce. It is part of the Treasure Coast region, one of the 10 Florida regional planning council regions. The map shows its 3 cities and towns and the 3 neighboring counties.
St. Lucie County facts
- County seat
- Fort Pierce
- Population (2025 estimate)
- 402,449 +22.2% since 2020
- Land area
- 572 sq mi 49th largest of 67
- Water area
- 116 sq mi
- Population density
- 704 per sq mi
- Established
- 1905
- Named after
- Saint Lucy saint from Italy
- Largest city
- Port St. Lucie 268,062
- Median household income
- $71,457
- Cities and towns
- 3 plus 7 CDPs
- ZIP codes
- 17
- Time zone
- Eastern
- FIPS code
- 12111
Cities and towns in St. Lucie County
St. Lucie County has 3 incorporated cities, towns and villages. Populations count the people living inside St. Lucie County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Port St. Lucie | City | 268,062 | |
| Fort Pierce (county seat) | City | 51,737 | |
| St. Lucie Village | Town | 642 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Lakewood Park | 13,866 | |
| Indian River Estates | 7,685 | |
| Fort Pierce North | 7,224 | |
| White City | 5,744 | |
| River Park | 5,714 | |
| Fort Pierce South | 5,028 | |
| Hutchinson Island South | 4,175 |
ZIP codes in St. Lucie County
17 ZIP codes reach into St. Lucie County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 34945
- 34946
- 34947
- 34949
- 34950
- 34951
- 34952
- 34953
- 34957 also Martin County
- 34972 also Okeechobee and Osceola counties
- 34981
- 34982
- 34983
- 34984
- 34986
- 34987
- 34990 also Martin County
Population of St. Lucie County, 2020–2025
St. Lucie County grew by 73,223 people (+22.2%) between April 2020 and July 2025: 3,127 more deaths than births and a net gain of 76,169 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 331,453 |
| 2021 | 344,403 |
| 2022 | 360,720 |
| 2023 | 377,820 |
| 2024 | 391,592 |
| 2025 | 402,449 |
Neighboring counties
- Martin County south · 166,272 people
- Indian River County north · 172,799 people
- Okeechobee County west · 42,608 people
Printable St. Lucie County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (127 KB)
- PNG (2400 px) (74 KB)
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Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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