Winamac is a town in Monroe Township, Pulaski County, in the U.S. state of Indiana. The population was 2,490 at the 2010 census. It is the county seat of Pulaski County.
The town's name came from the Potawatomi word for "catfish." It was selected as the county seat in 1839. Winamac was incorporated as a town in 1868.
The Winamac post office has been in operation since 1839.
Pulaski County Courthouse, Dr. George W. Thompson House, and Vurpillat's Opera House are listed on the National Register of Historic Places.
Winamac is located at 41°3′N 86°36′W (41.0525, -86.6044).
According to the 2010 census, Winamac has a total area of 1.36 square miles (3.52 km2), all land.
As of the census of 2010, there were 2,490 people, 1,028 households, and 617 families residing in the town. The population density was 1,830.9 inhabitants per square mile (706.9/km2). There were 1,140 housing units at an average density of 838.2 per square mile (323.6/km2). The racial makeup of the town was 97.2% White, 0.5% African American, 0.3% Native American, 0.4% Asian, 0.3% from other races, and 1.2% from two or more races. Hispanic or Latino of any race were 2.3% of the population.
There were 1,028 households of which 31.3% had children under the age of 18 living with them, 41.8% were married couples living together, 13.1% had a female householder with no husband present, 5.1% had a male householder with no wife present, and 40.0% were non-families.