Neponset is a village in Bureau County, Illinois, United States. The population was 473 at the 2010 census. It is part of the Ottawa–Streator Micropolitan Statistical Area.According to the 2010 census, Neponset has a total area of 1.04 square miles, all land.As of the census of 2000, there were 519 people, 200 households, and 146 families residing in the village. The population density was 498.0 people per square mile. There were 222 housing units at an average density of 213.0 per square mile. The racial makeup of the village was 99.47% White, 0.00% African American, 0.63% Asian, and 0.00% from two or more races. Hispanic or Latino of any race were 0.00% of the population.There were 200 households out of which 28.5% had children under the age of 18 living with them, 63.0% were married couples living together, 6.0% had a female householder with no husband present, and 27.0% were non-families. 23.0% of all households were made up of individuals and 12.