Marengo is a city in McHenry County, Illinois, United States on the Kishwaukee River. It lies approximately 60 miles west northwest of Chicago. Per the 2020 census, the population was 7,568. Geography Marengo is located at . The north edge of Marengo is bordered by the Kishwaukee River According to the 2010 census, Marengo has a total area of , all land. Major streets Grant Highway State Street Telegraph Street History Marengo was first named Pleasant Grove after a grove of trees near the town site. The present name commemorates the Battle of Marengo. A post office named Marengo was established in 1844. 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 were deemed "unlivable." Despite the extensive damage, no fatalities or serious injuries occurred; only two people were reported to have suffered minor injuries. Government Marengo is governed by the mayor, John Koziol, and a city council of eight aldermen. Demographics 2020 census 2000 Census As of the census of 2000, there were 6,355 people, 2,387 households, and 1,694 families residing in the city. The population density was . There were 2,475 housing units at an average density of . 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