Walnut, MS has a population of 1,128 and is the 14,407th largest city in the United States. The population density is 208 per sq mi which is 237% higher than the Mississippi average and 129% higher than the national average. The median age in Walnut is 36 which is approximately 3% lower than the Mississippi average of 37. In Walnut, 51% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 73% of Walnut residents were born in Mississippi, 27% were born out of state, 0% were born outside of the United States and 0% were foreign born.