Marengo, Illinois

Marengo population, 2020 to 2024

Marengo added 147 residents from July 2020 to July 2024, a change of +1.9%. In the latest year it moved by +79. Among 330 Illinois places of 5,000 or more, that growth ranks 45th; the median place changed by -0.9%. The median place of 5,000+ in Illinois has 14,760 people, so Marengo is 52% of it.

Marengo covers 8.90 square miles of land, for 865 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Marengo is less dense than the typical town.

What county Marengo is in

All of Marengo's residents live in McHenry County, which had 315,959 residents in 2024. Marengo holds 2.4% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Marengo

1 ZIP Code Tabulation Area (ZCTA) overlaps Marengo by at least 10% of the ZCTA's or the city's land: 60152. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Marengo is

The Census internal point of Marengo is at 42.246600, -88.597500. Springfield, the capital, is 179.0 miles SSW in a straight line. The nearest larger place is Woodstock, IL (25,892 people), 9.4 miles away. The nearest city of 100,000 or more is Elgin, IL, 20.0 miles away.

Daylight in Marengo

At 42.25° N, Marengo gets about 15 h 16 min of daylight around the June solstice and 9 h 05 min around the December solstice, a swing of 6 h 11 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Marengo

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Woodstock, 9.4 miles away, with 25,892 people.