City in Effingham County, Illinois · 1.5 sq mi · 1,418 people per sq mi
2,179 people live in Altamont. The typical household earns $75,510, and the median resident is 38.9 years old.
2026 projection
From 2,216 in 2020
Poverty rate 15.12%
Men 37.8 · Women 41.5
2010–2026
2,179
2026 projection
1.7% 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.
2010–2026
2,179
2026 projection
1.7% 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 | 2,179 | -7 | 0.32% |
|---|---|---|---|
| 2025 | 2,186 | -4 | 0.18% |
| 2024 | 2,190 | -1 | 0.05% |
| 2023 | 2,191 | +7 | 0.32% |
| 2022 | 2,184 | -14 | 0.64% |
| 2021 | 2,198 | -18 | 0.81% |
| 2020 | 2,216 | -21 | 0.94% |
| 2019 | 2,237 | +37 | 1.68% |
| 2018 | 2,200 | -12 | 0.54% |
| 2017 | 2,212 | -14 | 0.63% |
Showing 10 of 17 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.
Altamont has a population change lower than Effingham County, Illinois, 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 23 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
46% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 46% | 47% | 46% |
| Never married | 33% | 40% | 27% |
| Divorced | 9% | 9% | 10% |
| Widowed | 11% | 4% | 17% |
| Separated | <1% | 0% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources