Markleville is a town in Adams Township, Madison County, Indiana, United States. It is part of the Anderson, Indiana Metropolitan Statistical Area. The population was 528 at the 2010 census.
Markleville is located at 39°58′46″N 85°37′2″W (39.979501, -85.617273).
According to the 2010 census, Markleville has a total area of 0.56 square miles (1.45 km2), all land.
As of the census of 2010, there were 528 people, 196 households, and 142 families living in the town. The population density was 942.9 inhabitants per square mile (364.1/km2). There were 210 housing units at an average density of 375.0 per square mile (144.8/km2). The racial makeup of the town was 97.9% White, 0.2% African American, 0.2% Asian, 0.6% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 0.9% of the population.
There were 196 households, of which 38.8% had children under the age of 18 living with them, 58.2% were married couples living together, 10.7% had a female householder with no husband present, 3.6% had a male householder with no wife present, and 27.6% were non-families. 22.4% of all households were made up of individuals, and 10.7% had someone living alone who was 65 years of age or older.