City in Christian County, Illinois · 1 sq mi · 1,115 people per sq mi
1,104 people live in Assumption. The typical household earns $57,500, and the median resident is 37.2 years old.
2026 projection
From 1,155 in 2020
Poverty rate 11.66%
Men 38.9 · Women 35.3
2010–2026
1,104
2026 projection
4.4% 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
1,104
2026 projection
4.4% 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 | 1,104 | -8 | 0.72% |
|---|---|---|---|
| 2025 | 1,112 | -5 | 0.45% |
| 2024 | 1,117 | -4 | 0.36% |
| 2023 | 1,121 | -2 | 0.18% |
| 2022 | 1,123 | -14 | 1.23% |
| 2021 | 1,137 | -18 | 1.56% |
| 2020 | 1,155 | +3 | 0.26% |
| 2019 | 1,152 | -5 | 0.43% |
| 2018 | 1,157 | -5 | 0.43% |
| 2017 | 1,162 | -3 | 0.26% |
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.
Assumption has a population change lower than Christian 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 12 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
32% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 32% | 31% | 34% |
| Never married | 44% | 43% | 47% |
| Divorced | 16% | 21% | 10% |
| Widowed | 6% | 5% | 8% |
| Separated | 1% | <1% | 2% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources