Monroe County, Florida
County seat: Key West · Population 80,406 (2025) · 983 sq mi
Monroe County is the 39th most populous of Florida's 67 counties, with 80,406 people (2025 estimate). Its county seat is Key West. It is part of the South Florida region, one of the 10 Florida regional planning council regions. The map shows its 5 cities and towns and the 2 neighboring counties.
Monroe County facts
- County seat
- Key West
- Population (2025 estimate)
- 80,406 −3% since 2020
- Land area
- 983 sq mi 17th largest of 67
- Water area
- 4,307 sq mi
- Population density
- 82 per sq mi
- Established
- 1823
- Named after
- James Monroe president of the United States from 1817 to 1825 (1758–1831)
- Largest city
- Key West 24,999
- Median household income
- $87,738
- Cities and towns
- 5 plus 8 CDPs
- ZIP codes
- 11
- Time zone
- Eastern
- FIPS code
- 12087
Cities and towns in Monroe County
Monroe County has 5 incorporated cities, towns and villages. Populations count the people living inside Monroe County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Key West (county seat) | City | 24,999 | |
| Marathon | City | 10,060 | |
| Islamorada, Village of Islands | Village | 6,955 | |
| Key Colony Beach | City | 741 | |
| Layton | City | 209 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Key Largo | 13,026 | |
| Big Pine Key | 4,258 | |
| Stock Island | 4,162 | |
| Big Coppitt Key | 3,109 | |
| Cudjoe Key | 2,492 | |
| Tavernier | 2,413 | |
| North Key Largo | 1,808 | |
| Duck Key | 647 |
ZIP codes in Monroe County
11 ZIP codes reach into Monroe County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 33001
- 33034 also Miami-Dade County
- 33036
- 33037
- 33040
- 33042
- 33043
- 33050
- 33051
- 33070
- 34141 also Collier and Miami-Dade counties
Population of Monroe County, 2020–2025
Monroe County shrank by 2,465 people (−3%) between April 2020 and July 2025: 363 more deaths than births and a net loss of 2,141 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 82,851 |
| 2021 | 82,261 |
| 2022 | 82,696 |
| 2023 | 82,695 |
| 2024 | 82,015 |
| 2025 | 80,406 |
Neighboring counties
- Miami-Dade County east · 2,802,029 people
- Collier County northwest · 417,131 people
Printable Monroe 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) (173 KB)
- PNG (2400 px) (104 KB)
Paste this code to embed the map on your site:
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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