County Maps US

Union County, Florida

A county in Florida, ranked 59 of 67 by population.

CountyFIPS 12125

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

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Population
16,250
+808 (+5.2%) since 2020
Land area
243.9
square miles. A further 2.3% of the total area is water
Population density
66.6
people per square mile, computed rather than published
County seat
Lake Butler
Seat of county government.
Established
1921
104 years ago
Largest city
Lake Butler city
Population 1,921.

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 Union 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 Union 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 506 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 Union 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
Population16,25059th of 672,020th of 3,144
Land area243.9 sq mi67th of 672,923rd of 3,144
Population density66.6 per sq mi45th of 671,222nd of 3,144
Median household income$64,14638th of 671,695th of 3,143

Full data for Union County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population16,250Vintage 2025 Population Estimates
Population in 202015,442Vintage 2025 Population Estimates
2020 estimates base?16,145Vintage 2025 Population Estimates
Land area243.9 sq mi2025 Gazetteer Files
Water area5.9 sq mi2025 Gazetteer Files
Total area249.8 sq mi2025 Gazetteer Files
Population density?66.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$64,146American Community Survey 2020-2024 5-Year Estimates
Median home value$169,500American Community Survey 2020-2024 5-Year Estimates
Median age39.6American Community Survey 2020-2024 5-Year Estimates
Households4,316American Community Survey 2020-2024 5-Year Estimates
Housing units4,832American 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
-102
183 births, 285 deaths
Net migration
+589
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 Union 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
Bradford CountyFlorida30 mi28,307
Columbia CountyFlorida21 mi74,094
Baker CountyFlorida19 mi29,737
Alachua CountyFlorida10 mi290,028

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.