Marengo is a town in Liberty Township, Crawford County, Indiana, United States. The population was 828 at the 2010 census. One of the tourist attractions and sources of revenue for the town is Marengo Cave, a U.S. National Landmark. Originally discovered in 1883 by two schoolchildren, today it offers guided tours. History Marengo was originally called Big Springs, and under the latter name was platted in 1839. The name Marengo commemorates the Battle of Marengo. Marengo was devastated by an F3 tornado in 2004, resulting in damage to nearly 75 percent of the town and the death of one resident. Geography Marengo is located at (38.370579, -86.343425). According to the 2010 census, Marengo has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 828 people, 354 households, and 213 families living in the town. The population density was . There were 408 housing units at an average density of . The racial makeup of the town was 95.4% White, 0.1% African American, 0.8% Native American, 0.5% Pacific Islander, 0.5% from other races, and 2.7% from two or more races. Hispanic or Latino of any race were 2.1% of the population. There were 354 households, of which 34.5% had children under the age of 18 living with them, 39.8% were married couples living together, 15.0% had a female householder with no husband present, 5.4% had a male householder with no wife present, and 39.8% were non-families. 36.7% of all households were made up of individuals, and 15.6% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 3.02. The median age in the town was 36.2 years. 26.7% of residents were under the age of 18; 10.5% were between the ages of 18 and 24; 24% were from 25 to 44; 24% were from 45 to 64; and 14.5% were 65 years of age or older. The gender makeup of the town was 47.8% male and 52.2% female. 2000 census As of the census of 2000, there were 829 people, 363 households, and 218 families living in the town. The population density was . There were 403 housing units at an average density of . The racial makeup of the town was 98.31% White, 0.24% Native American, 0.12% Asian, 0.12% Pacific Islander, 0.60% from other races, and 0.60%