Ottawa Population

1850–2026

4,427

2026 projection

0.7% since 2020 (decrease)

01K2K3K4K5K186018801900192019401960198020002020

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.

Population by year

Population estimates for Ottawa. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
20264,427-100.23%
20254,437+240.54%
20244,413+20.05%
20234,411+40.09%
20224,407-350.79%
20214,442-140.31%
20204,456-110.25%
20194,467+190.43%
20184,448+60.14%
20174,442-140.31%

Showing 10 of 32 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.

Growth since 2020, compared

Ottawa has a population change lower than Putnam County, Ohio, and the U.S.

  • United States+3.1%
  • Ohio+0.9%
  • Putnam County0.0%
  • Ottawa−0.4%

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.

Ottawa Demographics

42.3median age

Median age

Female44 yrs
Male39.6 yrs

Adults

3,457
866 seniors (65+) · 25% of adults2,591 other adults

Sex

Female 54.3% · 2,411Male 45.7% · 2,030

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 44 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

Ottawa Income

$69,950median household income

Median household income

$69,950

Half of households earn more, half earn less

Median earnings

$52,027

Typical yearly pay for a worker 25 or older.

Poverty rate

8.6%

About 1 in 12 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Ottawa Marital Status

52% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married52%59%46%
Never married32%36%28%
Divorced6%3%8%
Widowed10%1%17%
Separated<1%<1%<1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201