Phelps City, MO has a population of 0 and is the 29,265th largest city in the United States. The population density is 0 per sq mi which is 100% lower than the Missouri average and 100% lower than the national average. The median age in Phelps City is 0 which is approximately 100% lower than the Missouri average of 38. In Phelps City, n/a of the population over 15 years of age are married, n/a speak English and n/a speak Spanish. n/a of Phelps City residents were born in Missouri, n/a were born out of state, n/a were born outside of the United States and n/a were foreign born.