Cassville, MO has a population of 3,328 and is the 8,291st largest city in the United States. The population density is 972 per sq mi which is 1026% higher than the Missouri average and 973% higher than the national average. The median age in Cassville is 37 which is approximately 3% lower than the Missouri average of 38. In Cassville, 68% of the population over 15 years of age are married, 93% speak English and 4% speak Spanish. 55% of Cassville residents were born in Missouri, 40% were born out of state, 0% were born outside of the United States and 4% were foreign born.