Belleville, WI has a population of 2,515 and is the 9,808th largest city in the United States. The population density is 1,586 per sq mi which is 1715% higher than the Wisconsin average and 1651% higher than the national average. The median age in Belleville is 34 which is approximately 14% lower than the Wisconsin average of 39. In Belleville, 69% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 83% of Belleville residents were born in Wisconsin, 16% were born out of state, 0% were born outside of the United States and 1% were foreign born.