Grayhawk, MO has a population of 629 and is the 18,134th largest city in the United States. The population density is 144 per sq mi which is 67% higher than the Missouri average and 59% higher than the national average. The median age in Grayhawk is 48 which is approximately 26% higher than the Missouri average of 38. In Grayhawk, 61% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 70% of Grayhawk residents were born in Missouri, 30% were born out of state, 0% were born outside of the United States and 0% were foreign born.