Marathon, Florida Demographics & Population 2026
During the 2020–2024 ACS period, Marathon, Florida had a total population of 9,914, the 350th largest city in Florida, with a median household income of $89,355, which is 20% higher than the state average. The poverty rate is 13.4%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Housing affordability is a challenge — homes cost 8.1x the median household income.
Marathon Quick Facts
How Marathon Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 9,831 | 9,914 | +0.8% |
| Median household income | $80,556 | $89,355 | +10.9% |
| Median home value | $683,700 | $725,800 | +6.2% |
How Marathon Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
Moderate diversity with one or two groups making up the majority.
State average: 65 | National average: 61
Education
Educational Attainment (Adults 25+)
Marathon Rankings in Florida
Explore Florida Rankings
Other Cities in Monroe County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Key West | 25,720 | $87,037 | 10.9% | $852,400 |
| Key Largo | 13,026 | $85,778 | 9.9% | $643,900 |
| Islamorada | 7,068 | $87,222 | 6.9% | $919,600 |
| Big Pine Key | 4,258 | $110,134 | 10.7% | $637,000 |
| Stock Island | 4,162 | $65,515 | 11.5% | $517,500 |
| Big Coppitt Key | 3,109 | $105,139 | 4.7% | $534,500 |
| Cudjoe Key | 2,492 | $87,500 | 8.6% | $857,400 |
| Tavernier | 2,413 | $50,256 | 17.6% | $613,700 |
| North Key Largo | 1,808 | $149,605 | 28.1% | $2,000,000+ |
| Duck Key | 647 | $156,719 | 13.0% | $1,051,000 |
Cities Similar to Marathon
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Bardmoor | 10,292 | $89,400 | $334,700 | 36.9% | 8.6% |
| Progress Village | 10,450 | $88,694 | $286,900 | 45.3% | 7.4% |
| Fuller Heights | 10,083 | $82,006 | $278,000 | 15.2% | 7.7% |
| Bithlo | 10,486 | $92,441 | $377,500 | 43.3% | 26.0% |
| Westwood Lakes | 10,553 | $86,040 | $518,500 | 26.2% | 8.3% |
Population Overview
Marathon is a small city located in Florida, within Monroe County. The total population is 9,914. It ranks as the 350th most populous out of 955 Census-designated places in Florida.
Age Demographics
The median age in Marathon is 45.6 years. This is 7% higher than the state median of 42.6 years.
Economy, Income & Housing
The median household income in Marathon is $89,355. This is 20% higher than the state median of $74,568. It is also 11% higher than the national median of $80,734. The poverty rate stands at 13.4%. This is 6% higher than the state poverty rate of 12.6%. The unemployment rate is 4.3%. This is 11% lower than the state rate of 4.8%. The median home value is $725,800. Housing costs are 102% higher than the state median of $359,000. The home-value-to-income ratio of 8.1x suggests that housing affordability is a significant concern for many residents. 60.2% of occupied housing units are owner-occupied. This homeownership rate is 11% lower than the state average of 67.6%.
Race & Ethnicity
The largest racial or ethnic group in Marathon is White (non-Hispanic), making up 59.5% of the population. Hispanic or Latino residents account for 34.2%. The Black or African American population (2.1%) is well below the state average of 14.6%. The Asian population (0.3%) is well below the state average of 2.9%.
Education
33.1% of residents aged 25 and older hold a bachelor's degree or higher. This is 3% lower than the state rate of 34.2%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 90.5%. Notably, 15.4% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Marathon, Florida is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Florida state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 955 Census-designated places in Florida. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Marathon, Florida?
Marathon, Florida has a population of 9,914 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Marathon, FL?
The median household income in Marathon is $89,355, which is 11% higher than the national median of $80,734.
What is the poverty rate in Marathon, FL?
The poverty rate in Marathon is 13.4%. This means approximately 1,322 residents live below the federal poverty line.
What is the racial makeup of Marathon, Florida?
Marathon's population is 59.5% White, 2.1% Black, 34.2% Hispanic/Latino, and 0.3% Asian.
What is the median home value in Marathon, FL?
The median home value in Marathon is $725,800. The home-value-to-income ratio is 8.1x.
How educated is Marathon, Florida?
33.1% of adults (25+) in Marathon hold a bachelor's degree or higher, and 15.4% hold a graduate or professional degree.