City in Auglaize County, Ohio · 4.7 sq mi · 1,799 people per sq mi
8,398 people live in St. Marys. The typical household earns $79,516, and the median resident is 36.6 years old.
2026 projection
From 8,397 in 2020
Poverty rate 6.58%
Men 35.4 · Women 40.1
1840–2026
8,398
2026 projection
0% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1840–2026
8,398
2026 projection
0% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 8,398 | 0 | 0.00% |
|---|---|---|---|
| 2025 | 8,398 | -12 | 0.14% |
| 2024 | 8,410 | -36 | 0.43% |
| 2023 | 8,446 | -6 | 0.07% |
| 2022 | 8,452 | +2 | 0.02% |
| 2021 | 8,450 | +53 | 0.63% |
| 2020 | 8,397 | 0 | 0.00% |
| 2019 | 8,397 | -33 | 0.39% |
| 2018 | 8,430 | +90 | 1.08% |
| 2017 | 8,340 | -17 | 0.20% |
Showing 10 of 34 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
St. Marys has a population change higher than Auglaize County, and lower than Ohio and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 83 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 15 residents
53% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 53% | 51% | 55% |
| Never married | 32% | 37% | 26% |
| Divorced | 9% | 9% | 8% |
| Widowed | 7% | 3% | 10% |
| Separated | <1% | <1% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources