Mound Valley, KS has a population of 427 and is the 20,501st largest city in the United States. The population density is 665 per sq mi which is 1796% higher than the Kansas average and 634% higher than the national average. The median age in Mound Valley is 43 which is approximately 19% higher than the Kansas average of 36. In Mound Valley, 58% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 63% of Mound Valley residents were born in Kansas, 37% were born out of state, 0% were born outside of the United States and 0% were foreign born.