| Place Name | Marengo |
| Place Type | City |
| ZIP Code(s) | 60152 |
| County | Mchenry County |
| Area Code(s) | 815,779 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 7,675 |
| Population Growth Rate (2010-19) | -1.05% |
| Majority Ethnicity | White 83.82% |
| Metro/Micro Stats Area | Chicago-Naperville-Elgin, IL-IN-WI |
| US Congressional District(s) | Illinois 14th |
| State House Districts | 63 |
| State Senate Districts | 32 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 83.82% |
| African American | 2.29% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 13.89% |