Belle, MO has a population of 1,653 and is the 12,130th largest city in the United States. The population density is 1,238 per sq mi which is 1334% higher than the Missouri average and 1267% higher than the national average. The median age in Belle is 40 which is approximately 4% higher than the Missouri average of 38. In Belle, 52% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 82% of Belle residents were born in Missouri, 16% were born out of state, 0% were born outside of the United States and 2% were foreign born.