Green Park, MO has a population of 2,625 and is the 9,543rd largest city in the United States. The population density is 1,928 per sq mi which is 2132% higher than the Missouri average and 2028% higher than the national average. The median age in Green Park is 48 which is approximately 25% higher than the Missouri average of 38. In Green Park, 59% of the population over 15 years of age are married, 93% speak English and 0% speak Spanish. 75% of Green Park residents were born in Missouri, 19% were born out of state, 1% were born outside of the United States and 5% were foreign born.