Eldorado is a town in Fond du Lac County, Wisconsin, United States. The population was 1,447 at the 2000 census. The unincorporated community of Eldorado is located in the town.According to the United States Census Bureau, the town has a total area of 36.2 square miles, of which, 35.8 square miles of it is land and 0.5 square miles of it is water.As of the census of 2000, there were 1,447 people, 490 households, and 420 families residing in the town. The population density was 40.5 people per square mile. There were 506 housing units at an average density of 14.1 per square mile. The racial makeup of the town was 99.45% White, 0.35% Asian, 0.14% from other races, and 0.07% from two or more races. Hispanic or Latino of any race were 0.55% of the population.There were 490 households out of which 38.4% had children under the age of 18 living with them, 78.0% were married couples living together, 4.3% had a female householder with no husband present, and 14.1% were non-families. 12.