How many people live in Monroe County, FL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 80,900 people living in Monroe County, FL. That makes Monroe County the 39th-most populous county in Florida. It is home to 0.34% of people living in the state.
80.9K
population of Monroe County, FL (2024)
0.34%
County share of the Florida population (2024)
About 80,900 people lived in Monroe County, FL in 2024.
Population estimates, 2000–2024
What are Monroe County, FL’s age demographics?
About 20,900 Monroe County, FL residents are aged 65 and older in 2024. That represents 25.9% of its population. For comparison, the age group represents 21.8% of Florida’s population and 18% in the US overall.
Another 12,600 Monroe County, FL residents, or 15.6% of the population, were children under 18. For comparison, the age group represents 19.3% of Florida’s population and 21.6% in the US overall.
A higher share of Monroe County, FL's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Monroe County, FL’s racial and ethnic demographics?
Non-Hispanic white residents make up 63.7% of the Monroe County, FL population, higher than the national share of 57.5%. Monroe County, FL also has a larger share of people identifying as Hispanic (26%) than the US overall (20%).
In contrast, Monroe County’s non-Hispanic Black or African American population accounts for 6.8%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 1.4% of the county, compared with 6.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Monroe County, FL has a higher share of a non-Hispanic white population than Florida as a whole.
Population estimates by race and ethnicity, (2024)
Key West, with about 25,200 residents in 2024, is the most populous city in Monroe County, FL.
Cities and towns in Monroe County, FL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Key West | 25,240 |
| 2. | Marathon | 10,039 |
| 3. | Islamorada, Village of Islands | 7,013 |
| 4. | Key Colony Beach | 749 |
| 5. | Layton | 208 |
| 6. | Balance of Monroe County | 37,659 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
