Watseka is a city in and the county seat of Iroquois County, Illinois, United States. It is located approximately 15 miles (24 km) west of the Illinois-Indiana state line on U.S. Route 24. The population of Watseka was 5,255 according to the 2010 census, which was a 7.3 percent decrease from the 2000 census.
Watseka is located near the center of Iroquois County, at the intersection of U.S. Route 24 and Illinois Route 1. The Iroquois River winds along the north side of the town and is joined by Sugar Creek on the west side of town. The south half of the town is in Belmont Township; the north half is in Middleport Township. According to the 2010 census, Watseka has a total area of 3.05 square miles (7.90 km²), all land.
As of the census of 2000, there were 5,670 people, 2,314 households, and 1,483 families residing in the city. The population density was 2,165.4 people per square mile (835.6/km²). There were 2,463 housing units at an average density of 940.6 per square mile (363.0/km²). The racial makeup of the city was 96.75% White, 0.62% African American, 0.26% Native American, 0.48% Asian, 0.86% from other races, and 1.02% from two or more races. Hispanic or Latino of any race were 2.61% of the population.
There were 2,314 households out of which 28.8% had children under the age of 18 living with them, 49.3% were married couples living together, 11.2% had a female householder with no husband present, and 35.9% were non-families. 31.2% of all households were made up of individuals and 15.8% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.93.
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