City in Adams County, Indiana · 6.1 sq mi · 1,660 people per sq mi
10,127 people live in Decatur. The typical household earns $58,646, and the median resident is 44.6 years old.
2026 projection
From 9,913 in 2020
Poverty rate 11.27%
Men 42.5 · Women 46.4
1850–2026
10,127
2026 projection
2.2% 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.
1850–2026
10,127
2026 projection
2.2% 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 | 10,127 | +37 | 0.37% |
|---|---|---|---|
| 2025 | 10,090 | +11 | 0.11% |
| 2024 | 10,079 | +4 | 0.04% |
| 2023 | 10,075 | +60 | 0.60% |
| 2022 | 10,015 | +43 | 0.43% |
| 2021 | 9,972 | +59 | 0.60% |
| 2020 | 9,913 | +54 | 0.55% |
| 2019 | 9,859 | +21 | 0.21% |
| 2018 | 9,838 | +35 | 0.36% |
| 2017 | 9,803 | +63 | 0.65% |
Showing 10 of 33 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.
Decatur is growing slower than Adams County, Indiana, 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 98 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 9 residents
46% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 46% | 50% | 42% |
| Never married | 22% | 24% | 21% |
| Divorced | 21% | 22% | 20% |
| Widowed | 10% | 3% | 16% |
| Separated | 1% | 2% | 1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources