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Marengo is a city located in McHenry County, Illinois. As of the 2000 census, the city had a total population of 6,355.
Marengo is located at 42°15'3" North, 88°36'18" West (42.250725, -88.604988).
According to the United States Census Bureau, the city has a total area of 10.3 km2 (4.0 mi2). 10.3 km2 (4.0 mi2) of it is land and none of it is covered by water.
The land which was to become Marengo was purchased from the Potowatami Native Americans in 1832. Marengo was established as a township in 1835.
Songwriter Egbert Van Alstyne was from Marengo. The only school designed by architect Louis Sullivan was built in Marengo (it was demolished in 1993).
Marengo is governed by a mayor and a city council of 8 aldermen.
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 616.5/km2 (1,598.5/mi2). There were 2,475 housing units at an average density of 240.1/km2 (622.6/mi2). 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% from other races, and 1.53% from two or more races. 13.00% of the population were Hispanic or Latino of any race.
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.
In the city 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. 4.4% of the population and 3.9% of families were below the poverty line. 5.4% of those under the age of 18 and 5.5% of those 65 and older were living below the poverty line.