St. Charles, AR has a population of 324 and is the 22,068th largest city in the United States. The population density is 362 per sq mi which is 553% higher than the Arkansas average and 300% higher than the national average. The median age in St. Charles is 41 which is approximately 7% higher than the Arkansas average of 38. In St. Charles, 69% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 77% of St. Charles residents were born in Arkansas, 19% were born out of state, 3% were born outside of the United States and 0% were foreign born.