Sunset Hills, MO has a population of 8,515 and is the 4,453rd largest city in the United States. The population density is 936 per sq mi which is 983% higher than the Missouri average and 933% higher than the national average. The median age in Sunset Hills is 47 which is approximately 23% higher than the Missouri average of 38. In Sunset Hills, 72% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 77% of Sunset Hills residents were born in Missouri, 20% were born out of state, 0% were born outside of the United States and 3% were foreign born.