Des Peres, MO has a population of 8,507 and is the 4,454th largest city in the United States. The population density is 1,961 per sq mi which is 2170% higher than the Missouri average and 2065% higher than the national average. The median age in Des Peres is 46 which is approximately 20% higher than the Missouri average of 38. In Des Peres, 73% of the population over 15 years of age are married, 94% speak English and 1% speak Spanish. 66% of Des Peres residents were born in Missouri, 28% were born out of state, 0% were born outside of the United States and 5% were foreign born.