Marengo Flag

Marengo

County:
McHenry County
County Seat:
No
Area (mi²):
8.902
State:
Illinois

Marengo is a city located in McHenry County, Illinois. Marengo has a 2026 population of 7,699. Marengo is currently growing at a rate of 1.04% annually and its population has increased by 1.95% since the most recent census, which recorded a population of 7,552 in 2020.

7.7K
Total Population
865
Density (mi²)
79 1.04%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)