Oskaloosa is a city located in Jefferson County Kansas. Oskaloosa has a 2020 population of 2,158. It is also the county seat of Jefferson County. Oskaloosa is currently growing at a rate of 0.56% annually but its population has decreased by -0.60% since the most recent census, which recorded a population of 2,171 in 2010. Oskaloosa reached it's highest population of 2,171 in 2010.
The average household income in Oskaloosa is $79,721 with a poverty rate of 7.31%. The median rental costs in recent years comes to $763 per month, and the median house value is $162,800. The median age in Oskaloosa is 41.5 years, 39.8 years for males, and 42.3 years for females.