Butler, MO has a population of 4,138 and is the 7,295th largest city in the United States. The population density is 1,018 per sq mi which is 1078% higher than the Missouri average and 1023% higher than the national average. The median age in Butler is 33 which is approximately 13% lower than the Missouri average of 38. In Butler, 50% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 69% of Butler residents were born in Missouri, 30% were born out of state, 0% were born outside of the United States and 1% were foreign born.