Dumas, MS has a population of 439 and is the 20,358th largest city in the United States. The population density is 113 per sq mi which is 83% higher than the Mississippi average and 24% higher than the national average. The median age in Dumas is 45 which is approximately 22% higher than the Mississippi average of 37. In Dumas, 66% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 75% of Dumas residents were born in Mississippi, 23% were born out of state, 1% were born outside of the United States and 1% were foreign born.