Kellerton is a city in Ringgold County, Iowa, United States. The population was 315 at the 2010 census.
Kellerton is located at 40°42′37″N 94°3′0″W (40.710220, -94.050100).
According to the United States Census Bureau, the city has a total area of 0.67 square miles (1.74 km2), of which 0.66 square miles (1.71 km2) is land and 0.01 square miles (0.03 km2) is water.
As of the census of 2010, there were 315 people, 126 households, and 88 families living in the city. The population density was 477.3 inhabitants per square mile (184.3/km2). There were 161 housing units at an average density of 243.9 per square mile (94.2/km2). The racial makeup of the city was 96.2% White, 1.0% Native American, 1.6% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 2.2% of the population.
There were 126 households of which 34.9% had children under the age of 18 living with them, 48.4% were married couples living together, 15.1% had a female householder with no husband present, 6.3% had a male householder with no wife present, and 30.2% were non-families. 22.2% of all households were made up of individuals and 11.9% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 2.91.