Kirkwood, MO has a population of 27,614 and is the 1,555th largest city in the United States. The population density is 3,015 per sq mi which is 3390% higher than the Missouri average and 3228% higher than the national average. The median age in Kirkwood is 43 which is approximately 11% higher than the Missouri average of 38. In Kirkwood, 65% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 66% of Kirkwood residents were born in Missouri, 30% were born out of state, 1% were born outside of the United States and 3% were foreign born.