Data / Population / Ottawa County

Population in Ottawa County

Population in Ottawa County was 39,481 in 2025, according to the U.S. Census Bureau. That is down 0.6% from 2024. That is the 62nd highest of 88 counties in 2025.

2025, persons39,481
Change on 2024-0.6%
Rank62nd of 88Counties in Ohio ranked
Series high40,3032020
Series low39,4812025

Population in Ottawa County, 2020 to 2025

CSVChart (SVG)

39.4K39.6K39.8K40K40.2K40.4K2020202120222023202420252020: 40,303 persons2021: 40,143 persons2022: 39,945 persons2023: 39,810 persons2024: 39,729 persons2025: 39,481 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202539,481
202439,729
202339,810
202239,945
202140,143
202040,303

Compared with Ohio and United States

Place2025
Ottawa County39,481
Ohio11,900,510
United States341,784,857

Rankings

Definition

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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What is the latest population in Ottawa County? Cite the source.
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Questions

What is the population in Ottawa County?

Population in Ottawa County was 39,481 in 2025, according to the U.S. Census Bureau. That is down 0.6% from 2024. That is the 62nd highest of 88 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved by Invokely on 2026-10-08.

What was the highest population in Ottawa County?

40,303 in 2020, the highest value since 2020 in this series.

More statistics for Ottawa County

All statistics for Ottawa County