Marengo, Illinois

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Buildings in downtown Marengo.
Buildings in downtown Marengo.
Home of Settlers Days
Location of Marengo in McHenry County, Illinois.
Location of Marengo in McHenry County, Illinois.
Location of Illinois in the United States
Location of Illinois in the United States
Coordinates: 42°15′03″N 88°36′18″W / 42.25083°N 88.60500°W / 42.25083; -88.60500Coordinates: 42°15′03″N 88°36′18″W / 42.25083°N 88.60500°W / 42.25083; -88.60500
CountryUnited States
TownshipMarengo, Seneca, Coral, Riley
 • MayorJohn Koziol
 • Total8.54 sq mi (22.11 km2)
 • Land8.54 sq mi (22.11 km2)
 • Water0.00 sq mi (0.00 km2)
Elevation833 ft (254 m)
 • Total7,648
 • Estimate 
 • Density871.25/sq mi (336.40/km2)
Time zoneUTC-6 (CST)
 • Summer (DST)UTC-5 (CDT)
ZIP Code(s)
Area code(s)815
FIPS code17-46786
Wikimedia CommonsMarengo, Illinois

Marengo is a city in McHenry County, Illinois, United States approximately 60 miles west northwest of Chicago. The population was 7,648 as of the 2010 census.


Marengo is located at 42°15′3″N 88°36′18″W / 42.25083°N 88.60500°W / 42.25083; -88.60500.[4]

According to the 2010 census, Marengo has a total area of 5.01 square miles (12.98 km2), all land.[5]

Major streets[edit]

  • US 20.svg Grant Highway
  • Illinois 23.svg State Street
  • Illinois 176.svg Telegraph Street


Marengo was first named Pleasant Grove after a grove of trees near the town site.[6] The present name commemorates the Battle of Marengo.[6] A post office named Marengo was established in 1844.[7]

In the early morning of June 11, 2017 at around 4:50 A.M., a house in the northwest suburbs exploded. The gas explosion set four houses on fire and damaged 50 more, nearly 20 of which have been deemed "unlivable." Despite the extensive damage, no fatalities or serious injuries occurred; only two people were reported to have suffered minor injuries.[8][9]


Marengo is governed by the mayor, John Koziol, and a city council of eight aldermen.


Historical population
Census Pop.
2019 (est.)7,437[3]−2.8%
U.S. Decennial Census[10]

As of the census[11] of 2000, there were 6,355 people, 2,387 households, and 1,694 families residing in the city. The population density was 1,598.5 people per square mile (616.5/km2). There were 2,475 housing units at an average density of 622.6 per square mile (240.1/km2). The racial makeup of the city was 92.07% White, 0.30% African American, 0.27% Native American, 0.28% Asian, 0.02% Pacific Islander, 5.54% of other races, and 1.53% of two or more races. Hispanic or Latino of any race were 13.00% of the population.

There were 2,387 households, out of which 38.6% had children under the age of 18 living with them, 55.9% were married couples living together, 10.7% had a female householder with no husband present, and 29.0% were non-families. 24.9% of all households were made up of individuals, and 9.8% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.17.

The population was spread out, with 29.3% under the age of 18, 8.6% from 18 to 24, 31.0% from 25 to 44, 19.2% from 45 to 64, and 12.0% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 96.3 males. For every 100 females age 18 and over, there were 94.3 males.

The median income for a household in the city was $50,214, and the median income for a family was $57,209. Males had a median income of $41,298 versus $26,317 for females. The per capita income for the city was $22,225. About 3.9% of families and 4.4% of the population were below the poverty line, including 5.4% of those under age 18 and 5.5% of those age 65 or over.

Notable people[edit]


The Marengo-Union Times is the newspaper of record in Marengo, IL. It has a circulation of 6,300 and is mailed to every home and business in the greater Marengo and Union, Illinois area.


  1. ^ "2019 U.S. Gazetteer Files". United States Census Bureau. Retrieved July 14, 2020.
  2. ^ "USGS detail on Newtown". Retrieved 2007-10-21.
  3. ^ a b "Population and Housing Unit Estimates". United States Census Bureau. May 24, 2020. Retrieved May 27, 2020.
  4. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
  5. ^ "G001 - Geographic Identifiers - 2010 Census Summary File 1". United States Census Bureau. Archived from the original on 2020-02-13. Retrieved 2015-12-27.
  6. ^ a b Chicago and North Western Railway Company (1908). A History of the Origin of the Place Names Connected with the Chicago & North Western and Chicago, St. Paul, Minneapolis & Omaha Railways. p. 98.
  7. ^ "McHenry County". Jim Forte Postal History. Retrieved 22 March 2015.
  8. ^ Marrazzo, Amanda. "'A miracle' that no one killed during Marengo explosion that set 4 houses ablaze". Retrieved 2018-12-30.
  9. ^ Rohr, Lauren (2018-06-11). "One year after Marengo neighborhood explosion, families still seeking normalcy". Daily Herald. Retrieved 2018-12-30.
  10. ^ "Census of Population and Housing". Retrieved June 4, 2015.
  11. ^ "U.S. Census website". United States Census Bureau. Retrieved 2008-01-31.

External links[edit]