Melvern, KS has a population of 490 and is the 19,667th largest city in the United States. The population density is 1,377 per sq mi which is 3825% higher than the Kansas average and 1420% higher than the national average. The median age in Melvern is 34 which is approximately 6% lower than the Kansas average of 36. In Melvern, 56% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 75% of Melvern residents were born in Kansas, 24% were born out of state, 1% were born outside of the United States and 0% were foreign born.