City in Monroe County, Illinois · 8.2 sq mi · 1,358 people per sq mi
About 11,000 people live in Waterloo. The typical household earns $98,711, and the median resident is 41.5 years old.
2026 projection
From 10,994 in 2020
Poverty rate 5.89%
Men 39.8 · Women 43.1
1850–2026
11,182
2026 projection
1.7% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1850–2026
11,182
2026 projection
1.7% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 11,182 | +50 | 0.45% |
|---|---|---|---|
| 2025 | 11,132 | -64 | 0.57% |
| 2024 | 11,196 | -7 | 0.06% |
| 2023 | 11,203 | +58 | 0.52% |
| 2022 | 11,145 | +72 | 0.65% |
| 2021 | 11,073 | +79 | 0.72% |
| 2020 | 10,994 | +429 | 4.06% |
| 2019 | 10,565 | +117 | 1.12% |
| 2018 | 10,448 | +84 | 0.81% |
| 2017 | 10,364 | +120 | 1.17% |
Showing 10 of 33 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 111 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 17 residents
53% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 53% | 56% | 51% |
| Never married | 26% | 30% | 22% |
| Divorced | 11% | 11% | 12% |
| Widowed | 9% | 4% | 14% |
| Separated | <1% | 0% | 1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau