Belleville is a city in and the county seat of Republic County, Kansas, United States. As of the 2020 census, the population of the city was 2,007.

Belleville was founded in 1869, and incorporated as a city in 1878. It was named for Arabelle Tutton, the wife of a member of the town company.

The first post office in Belleville was established in February 1870.

According to the United States Census Bureau, the city has a total area of 2.02 square miles (5.23 km), of which 1.98 square miles (5.13 km) is land and 0.04 square miles (0.10 km) is water.

Historical population

Census	Pop.	Note	%±
1880	238		—
1890	1,868		684.9%
1900	1,833		−1.9%
1910	2,224		21.3%
1920	2,254		1.3%
1930	2,383		5.7%
1940	2,580		8.3%
1950	2,858		10.8%
1960	2,940		2.9%
1970	3,063		4.2%
1980	2,805		−8.4%
1990	2,517		−10.3%
2000	2,239		−11.0%
2010	1,991		−11.1%
2020	2,007		0.8%
U.S. Decennial Census

The 2020 United States census counted 2,007 people, 919 households, and 490 families in Belleville. The population density was 976.2 per square mile (376.9/km). There were 1,157 housing units at an average density of 562.7 per square mile (217.3/km). The racial makeup was 93.72% (1,881) white or European American (92.48% non-Hispanic white), 0.25% (5) black or African-American, 0.5% (10) Native American or Alaska Native, 0.5% (10) Asian, 0.25% (5) Pacific Islander or Native Hawaiian, 0.3% (6) from other races, and 4.48% (90) from two or more races. Hispanic or Latino of any race was 2.59% (52) of the population.

Of the 919 households, 22.3% had children under the age of 18; 41.2% were married couples living together; 32.6% had a female householder with no spouse or partner present. 42.2% of households consisted of individuals and 23.1% had someone living alone who was 65 years of age or older. The average household size was 2.1 and the average family size was 3.0. The percent of those with a bachelor’s degree or higher was estimated to be 16.5% of the population.

22.2% of the population was under the age of 18, 6.3% from 18 to 24, 20.7% from 25 to 44, 23.6% from 45 to 64, and 27.2% who were 65 years of age or older. The median age was 46.8 years. For every 100 females, there were 111.0 males. For every 100 females ages 18 and older, there were 114.7 males.

The 2016-2020 5-year American Community Survey estimates show that the median household income was $40,238 (with a margin of error of +/- $8,612) and the median family income was $62,813 (+/- $8,702). Males had a median income of $34,273 (+/- $1,482) versus $25,293 (+/- $7,452) for females. The median income for those above 16 years old was $31,806 (+/- $6,989). Approximately, 4.8% of families and 12.2% of the population were below the poverty line, including 19.2% of those under the age of 18 and 3.8% of those ages 65 or over.

As of the census of 2010, there were 1,991 people, 949 households, and 533 families living in the city. The population density was 1,005.6 inhabitants per square mile (388.3/km). There were 1,162 housing units at an average density of 586.9 per square mile (226.6/km). The racial makeup of the city was 97.5% White, 0.3% African American, 0.2% Native American, 0.6% Asian, 0.5% from other races, and 1.0% from two or more races. Hispanic or Latino of any race were 1.4% of the population.

There were 949 households, of which 19.8% had children under the age of 18 living with them, 47.3% were married couples living together, 6.7% had a female householder with no husband present, 2.1% had a male householder with no wife present, and 43.8% were non-families. 41.3% of all households were made up of individuals, and 24.5% had someone living alone who was 65 years of age or older. The average household size was 1.99 and the average family size was 2.67.

The median age in the city was 51.6 years. 18.1% of residents were under the age of 18; 4.5% were between the ages of 18 and 24; 18% were from 25 to 44; 26.5% were from 45 to 64; and 32.9% were 65 years of age or older. The gender makeup of the city was 46.3% male and 53.7% female.

As of the census of 2000, there were 2,239 people, 1,045 households, and 606 families living in the city. The population density was 1,153.0 inhabitants per square mile (445.2/km). There were 1,259 housing units at an average density of 648.4 per square mile (250.3/km). 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.

There were 1,045 households, out of which 20.4% had children under the age of 18 living with them, 49.0% were married couples living together, 7.2% had a female householder with no husband present, and 42.0% were non-families. 39.8% of all households were made up of individuals, and 23.3% had someone living alone who was 65 years of age or older. The average household size was 2.01 and the average family size was 2.67.

In the city, the population was spread out, with 17.6% under the age of 18, 5.4% from 18 to 24, 20.0% from 25 to 44, 22.9% from 45 to 64, and 34.1% who were 65 years of age or older. The median age was 51 years. For every 100 females, there were 79.1 males. For every 100 females age 18 and over, there were 78.2 males.

The median income for a household in the city was $26,692, and the median income for a family was $36,515. Males had a median income of $24,743 versus $16,964 for females. The per capita income for the city was $18,989. About 5.4% of families and 8.7% of the population were below the poverty line, including 16.9% of those under age 18 and 7.6% of those age 65 or over.

The city is served by The Belleville Telescope newspaper, established in 1870 and published continuously since 1873.

The community is served by Republic County USD 109 public school district. It was formed in 2006 by the consolidation of Belleville USD 427 and Hillcrest USD 455.

• Blair Theatre
• Boyer Gallery
• Republic County Historical Society Museum
• Belleville High Banks, Named "The fastest dirt track in the world"

• Larry Cheney (1886–1969), Major League Baseball player
• Nick Hague (born 1975), NASA astronaut, Colonel in United States Air Force, born in Belleville
• Dean Nesmith, professional football player and noted athletic trainer
• A.Q. Miller, namesake of the A.Q. Miller School of Journalism and Mass Communications at Kansas State University.

• City of Belleville
• Belleville - Directory of Public Officials
• Belleville History
• Belleville city map, KDOT