City in Franklin County, Kansas · 10.7 sq mi · 1,194 people per sq mi
12,736 people live in Ottawa. The typical household earns $71,699, and the median resident is 36.9 years old.
2026 projection
From 12,625 in 2020
Poverty rate 9.1%
Men 36.2 · Women 37.4
1870–2026
12,736
2026 projection
0.9% 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.
1870–2026
12,736
2026 projection
0.9% 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 | 12,736 | +20 | 0.16% |
|---|---|---|---|
| 2025 | 12,716 | +2 | 0.02% |
| 2024 | 12,714 | +11 | 0.09% |
| 2023 | 12,703 | +104 | 0.83% |
| 2022 | 12,599 | -38 | 0.30% |
| 2021 | 12,637 | +12 | 0.10% |
| 2020 | 12,625 | +56 | 0.45% |
| 2019 | 12,569 | +23 | 0.18% |
| 2018 | 12,546 | +12 | 0.10% |
| 2017 | 12,534 | +63 | 0.51% |
Showing 10 of 31 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.
Ottawa is growing slower than Franklin County, Kansas, 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 127 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 11 residents
49% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 49% | 49% | 48% |
| Never married | 33% | 36% | 30% |
| Divorced | 12% | 13% | 12% |
| Widowed | 6% | 2% | 11% |
| Separated | 0% | 0% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources