Watseka is a city located in Iroquois County Illinois. It is also the county seat of Iroquois County. With a 2020 population of 4,623, it is the 345th largest city in Illinois and the 4983rd largest city in the United States . Watseka is currently declining at a rate of -1.53% annually and its population has decreased by -12.03% since the most recent census, which recorded a population of 5,255 in 2010. Watseka reached it's highest population of 5,670 in 2000. Spanning over 3 miles, Watseka has a population density of 1,570 people per square mile.
The average household income in Watseka is $53,349 with a poverty rate of 14.22%. The median rental costs in recent years comes to $648 per month, and the median house value is $85,500. The median age in Watseka is 44.9 years, 42.6 years for males, and 46.9 years for females.