City in Monroe County, Florida · 8.4 sq mi · 1,200 people per sq mi
About 10,000 people live in Marathon. The typical household earns $89,355, and the median resident is 45.6 years old.
2026 projection
From 9,863 in 2020
Poverty rate 13.37%
Men 46.7 · Women 43
1970–2026
10,139
2026 projection
2.8% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1970–2026
10,139
2026 projection
2.8% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 10,139 | +79 | 0.79% |
|---|---|---|---|
| 2025 | 10,060 | -120 | 1.18% |
| 2024 | 10,180 | +65 | 0.64% |
| 2023 | 10,115 | +130 | 1.30% |
| 2022 | 9,985 | +65 | 0.66% |
| 2021 | 9,920 | +57 | 0.58% |
| 2020 | 9,863 | +1,323 | 15.49% |
| 2019 | 8,540 | -18 | 0.21% |
| 2018 | 8,558 | -264 | 2.99% |
| 2017 | 8,822 | -20 | 0.23% |
Showing 10 of 21 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 99 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 7 residents
56% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 56% | 54% | 58% |
| Never married | 25% | 27% | 23% |
| Divorced | 14% | 14% | 14% |
| Widowed | 4% | 4% | 5% |
| Separated | 1% | 1% | 1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau