City in McHenry County, Illinois · 8.9 sq mi · 873 people per sq mi
About 7,800 people live in Marengo. The typical household earns $73,523, and the median resident is 31.9 years old.
2026 projection
From 7,553 in 2020
Poverty rate 15.74%
Men 30.7 · Women 33.9
1860–2026
7,772
2026 projection
2.9% 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.
1860–2026
7,772
2026 projection
2.9% 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 | 7,772 | +35 | 0.45% |
|---|---|---|---|
| 2025 | 7,737 | +44 | 0.57% |
| 2024 | 7,693 | +71 | 0.93% |
| 2023 | 7,622 | +53 | 0.70% |
| 2022 | 7,569 | -14 | 0.18% |
| 2021 | 7,583 | +30 | 0.40% |
| 2020 | 7,553 | +118 | 1.59% |
| 2019 | 7,435 | -34 | 0.46% |
| 2018 | 7,469 | +1 | 0.01% |
| 2017 | 7,468 | -10 | 0.13% |
Showing 10 of 32 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 70 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 6 residents
44% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 44% | 46% | 43% |
| Never married | 37% | 40% | 34% |
| Divorced | 8% | 9% | 8% |
| Widowed | 10% | 5% | 14% |
| Separated | <1% | <1% | 1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau