County Maps US

Seminole County, Florida

A county in Florida, ranked 13 of 67 by population.

CountyFIPS 12117

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

Download SVGFull Florida map downloads

Population
491,884
+20,413 (+4.3%) since 2020
Land area
309.4
square miles. A further 10.4% of the total area is water
Population density
1,590
people per square mile, computed rather than published
County seat
Sanford
Seat of county government.
Established
1913
112 years ago
Largest city
Sanford city
Population 67,483.

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 Seminole 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 Seminole 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 549 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 Seminole 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
Population491,88413th of 67151st of 3,144
Land area309.4 sq mi64th of 672,786th of 3,144
Population density1,590 per sq mi4th of 67101st of 3,144
Median household income$85,7617th of 67406th of 3,143

Full data for Seminole County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population491,884Vintage 2025 Population Estimates
Population in 2020471,471Vintage 2025 Population Estimates
2020 estimates base?470,856Vintage 2025 Population Estimates
Land area309.4 sq mi2025 Gazetteer Files
Water area35.9 sq mi2025 Gazetteer Files
Total area345.3 sq mi2025 Gazetteer Files
Population density?1,590 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$85,761American Community Survey 2020-2024 5-Year Estimates
Median home value$386,900American Community Survey 2020-2024 5-Year Estimates
Median age39.8American Community Survey 2020-2024 5-Year Estimates
Households187,248American Community Survey 2020-2024 5-Year Estimates
Housing units199,565American 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
+657
4,456 births, 3,799 deaths
Net migration
+1,524
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 4 areas bordering Seminole 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
Volusia CountyFlorida47 mi606,573
Orange CountyFlorida43 mi1,528,002
Lake CountyFlorida8.9 mi456,068
Brevard CountyFloridaa single point663,982

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

Side by side

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.