Montgomery City, MO has a population of 2,757 and is the 9,230th largest city in the United States. The population density is 817 per sq mi which is 845% higher than the Missouri average and 802% higher than the national average. The median age in Montgomery City is 36 which is approximately 5% lower than the Missouri average of 38. In Montgomery City, 55% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 82% of Montgomery City residents were born in Missouri, 17% were born out of state, 0% were born outside of the United States and 1% were foreign born.