Belleville is a city located in Republic County Kansas. It is also the county seat of Republic County. With a 2020 population of 1,869, it is the 124th largest city in Kansas and the 7869th largest city in the United States . Belleville is currently declining at a rate of -0.27% annually and its population has decreased by -6.13% since the most recent census, which recorded a population of 1,991 in 2010. Belleville reached it's highest population of 1,973 in 2010. Spanning over 2 miles, Belleville has a population density of 913 people per square mile.
The average household income in Belleville is $51,290 with a poverty rate of 13.53%. The median rental costs in recent years comes to $606 per month, and the median house value is $66,600. The median age in Belleville is 46.3 years, 40 years for males, and 50.9 years for females.