City in Seneca County, Ohio · 7.4 sq mi · 2,405 people per sq mi
17,750 people live in Tiffin. The typical household earns $56,198, and the median resident is 34.1 years old.
2026 projection
From 17,953 in 2020
Poverty rate 14.75%
Men 32.3 · Women 36.5
1830–2026
17,750
2026 projection
1.1% since 2020 (decrease)
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.
1830–2026
17,750
2026 projection
1.1% since 2020 (decrease)
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 | 17,750 | -53 | 0.30% |
|---|---|---|---|
| 2025 | 17,803 | -13 | 0.07% |
| 2024 | 17,816 | -12 | 0.07% |
| 2023 | 17,828 | -46 | 0.26% |
| 2022 | 17,874 | -100 | 0.56% |
| 2021 | 17,974 | +21 | 0.12% |
| 2020 | 17,953 | -126 | 0.70% |
| 2019 | 18,079 | +86 | 0.48% |
| 2018 | 17,993 | +54 | 0.30% |
| 2017 | 17,939 | +61 | 0.34% |
Showing 10 of 35 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.
Tiffin has a population change lower than Seneca County, 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 178 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
35% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 35% | 38% | 32% |
| Never married | 43% | 49% | 37% |
| Divorced | 13% | 8% | 18% |
| Widowed | 7% | 3% | 12% |
| Separated | 2% | 2% | 2% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources