Marathon city, Florida
Official LSAD Designation: Marathon city • Census GEOID: 1243000
• Monroe County
Demographics & Population Profile
Population and demographics for Marathon city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 10,060 | — | 2025 | Census |
| Median Age | 45.6 yrs | ±3.9 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 4,018 | ±247 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).