County Maps US

Monroe County, Florida

A county in Florida, ranked 39 of 67 by population.

CountyFIPS 12087

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

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Population
80,406
-2,445 (-3.0%) since 2020
Land area
983
square miles. A further 81.4% of the total area is water
Population density
81.8
people per square mile, computed rather than published
County seat
Key West
Seat of county government.
Established
1823
202 years ago
Largest city
Key West city
Population 24,999.

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 Monroe 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 Monroe 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 465 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 Monroe 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
Population80,40639th of 67732nd of 3,144
Land area983 sq mi17th of 67700th of 3,144
Population density81.8 per sq mi43rd of 671,060th of 3,144
Median household income$87,7386th of 67357th of 3,143

Full data for Monroe County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population80,406Vintage 2025 Population Estimates
Population in 202082,851Vintage 2025 Population Estimates
2020 estimates base?82,871Vintage 2025 Population Estimates
Land area983 sq mi2025 Gazetteer Files
Water area4,307 sq mi2025 Gazetteer Files
Total area5,290 sq mi2025 Gazetteer Files
Population density?81.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$87,738American Community Survey 2020-2024 5-Year Estimates
Median home value$780,600American Community Survey 2020-2024 5-Year Estimates
Median age49.2American Community Survey 2020-2024 5-Year Estimates
Households34,405American Community Survey 2020-2024 5-Year Estimates
Housing units54,834American 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
-25
705 births, 730 deaths
Net migration
-1,572
More people moved out than moved in.

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

The 2 areas bordering Monroe 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
Miami-Dade CountyFlorida149 mi2,802,029
Collier CountyFlorida61 mi417,131

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.