Marengo city, Illinois
Official LSAD Designation: Marengo city • Census GEOID: 1746786
• McHenry County
Marengo city is an incorporated city in McHenry County, Illinois. According to official records from the Census (2025), Marengo city had an estimated population of 7,737 residents. Official Census Bureau geographic records classify this community under LSAD designation Marengo city (GEOID 1746786).
Local Government Administration U.S. Census Bureau GMAF
City Of Marengo
Municipal
Official Title:
Asst. Treasurer
Address:
132 E PRAIRIE ST, MARENGO IL 60152-3128
County Of Mchenry
County
Official Title:
Auditor
Address:
2200 N SEMINARY AVE, WOODSTOCK IL 60098-2693
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 7,737 | 2025 |
| Median Household Income | $73,523 | 2020-2024 |
| Median Home Value | $229,900 | 2020-2024 |
| Land Area | 8.88 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).