Eldorado is a town in Jackson County, Oklahoma, United States.

The Southern Baptist pastor, W. A. Criswell, was born in Eldorado in 1909.

According to the United States Census Bureau, the town has a total area of 0.8 square miles (2.1 km2), all land.

There were 274 housing units at an average density of 389.9 per square mile (150.5/km2).

35.9% of all households were made up of individuals, and 23.9% had someone living alone who was 65 years of age or older.