Dellwood, MO has a population of 5,020 and is the 6,456th largest city in the United States. The population density is 4,859 per sq mi which is 5525% higher than the Missouri average and 5263% higher than the national average. The median age in Dellwood is 33 which is approximately 13% lower than the Missouri average of 38. In Dellwood, 41% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 82% of Dellwood residents were born in Missouri, 17% were born out of state, 0% were born outside of the United States and 1% were foreign born.