Newtown, MO has a population of 245 and is the 23,521st largest city in the United States. The population density is 970 per sq mi which is 1023% higher than the Missouri average and 971% higher than the national average. The median age in Newtown is 48 which is approximately 26% higher than the Missouri average of 38. In Newtown, 55% of the population over 15 years of age are married, 87% speak English and 12% speak Spanish. 44% of Newtown residents were born in Missouri, 50% were born out of state, 0% were born outside of the United States and 6% were foreign born.