Dardenne Prairie, MO has a population of 12,692 and is the 3,273rd largest city in the United States. The population density is 2,454 per sq mi which is 2740% higher than the Missouri average and 2608% higher than the national average. The median age in Dardenne Prairie is 41 which is approximately 7% higher than the Missouri average of 38. In Dardenne Prairie, 71% of the population over 15 years of age are married, 95% speak English and 2% speak Spanish. 62% of Dardenne Prairie residents were born in Missouri, 33% were born out of state, 1% were born outside of the United States and 3% were foreign born.