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Marengo, IL
City in McHenry County, Illinois.
Population
7,040
Land area
8.9sq mi
People per sq mi
791
ZIP codes
0
Marengo and its ZIP codes
Marengo at a glance
- Marengo is about 3.5 times as dense as Illinois as a whole.
- It is the 282nd most populous of 1,445 cities and towns in Illinois.
- Households here earn a median of $73,523 a year, 12% less than the Illinois figure of $83,390.
- A typical owner-occupied home is valued at $229,900 (13% below Illinois) and median rent is $1,176 a month.
Local data for Marengo, IL
Counts from official public data
Housing and community stats
Marengo, IL, American Community Survey 2020-2024
Median household income
$73,523
Poverty rate
15.7%
Median home value
$229,900
Median rent
$1,176/mo
Homeownership
63.1%
Bachelor's or higher
15.4%
Median age
31.9
Average commute
30.1 min
Largest reported origins and ancestries: German Americans (2,044), Irish Americans (1,111), Italian Americans (819).
Economy and federal money
Jobs, pay, income and spending are for McHenry County. PPP loans are for Marengo.
Unemployment rate
4.7%
Aug 2026, +1.0 pts in a year
Average annual pay
$57,103
98,058 jobs, 2025
Income per person
$72,162
BEA, 2024
Federal spending
$1.9B
FY 2026, $6,123 per person
How people get to work
Marengo, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone80.2%
- Carpooled11.0%
- Public transit0.0%
- Walked0.0%
- Bicycle0.0%
- Taxi, ride-hailing, motorcycle or other0.8%
- Worked from home8.0%
Average one-way commute: 30.1 minutes for people who do not work from home.
Environment and hazard risk
Marengo, IL, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Moderate
Top: cold wave
Storm events since 1996
783
Countywide, mostly thunderstorm wind
Flood insurance policies
764
0.7% of homes, county
July high / Jan low
84° / 13°F
37.6 inches of rain a year
Hazards, floods and storm historyCheck a flood zone2 historic places
Health statistics
Share of adults in Marengo, IL, CDC PLACES estimates
Obesity
34.0%
U.S. 33.3% +0.7 pts
Diabetes
10.8%
U.S. 12.1% -1.3 pts
Smoking
13.3%
U.S. 12.8% +0.5 pts
Uninsured (18-64)
9.2%
U.S. 11.1% -1.9 pts
Cities near Marengo
| Name | Distance | Land area (sq mi) |
|---|---|---|
| RileyCensus-designated place | 2.3 mi | 0.2 |
| Garden PrairieCensus-designated place | 4.2 mi | 0.6 |
| CoralCensus-designated place | 4.3 mi | 0 |
| UnionVillage | 5.3 mi | 0.8 |
| HarmonyCensus-designated place | 7.5 mi | 0.5 |
| FranklinvilleCensus-designated place | 7.8 mi | 0.2 |
| GenoaCity | 9.3 mi | 2.6 |
| HampshireVillage | 9.5 mi | 10 |
| KingstonVillage | 9.8 mi | 1 |
| BelvidereCity | 9.9 mi | 12.7 |
| HartlandCensus-designated place | 12 mi | 0.3 |
| WoodstockCity | 12 mi | 13.2 |
| HuntleyVillage | 12 mi | 14.7 |
| LakewoodVillage | 13 mi | 4.6 |
| CapronVillage | 13 mi | 0.8 |
| Poplar GroveVillage | 13 mi | 7.9 |
Frequently asked questions
- What county is Marengo, IL in?
- Marengo is in McHenry County, Illinois.
- What is the population of Marengo, IL?
- About 7,040 people live in Marengo, based on American Community Survey 5-year estimates.
- What cities are near Marengo?
- Nearby places include Riley (2.3 mi), Garden Prairie (4.2 mi), Coral (4.3 mi), Union (5.3 mi), Harmony (7.5 mi).
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023