Belleville is a city in and the county seat of Republic County, Kansas, United States. As of the 2010 census, the city population was 1,991.
Belleville is located at 39°49′25″N 97°37′49″W / 39.82361°N 97.63028°W / 39.82361; -97.63028 (39.823548, -97.630183). According to the United States Census Bureau, the city has a total area of 2.0 square miles (5.1 km²), of which, 1.9 square miles (5.0 km²) of it is land and 0.04 square miles (0.1 km²) of it (2.02%) is water.
As of the census of 2000, there were 2,239 people, 1,045 households, and 606 families residing in the city. The population density was 1,153.0 people per square mile (445.6/km²). There were 1,259 housing units at an average density of 648.4 per square mile (250.6/km²). The racial makeup of the city was 98.35% White, 0.27% African American, 0.18% Native American, 0.31% Asian, 0.31% from other races, and 0.58% from two or more races. Hispanic or Latino of any race were 0.80% of the population.