Seminary, MS has a population of 514 and is the 19,371st largest city in the United States. The population density is 340 per sq mi which is 452% higher than the Mississippi average and 275% higher than the national average. The median age in Seminary is 39 which is approximately 5% higher than the Mississippi average of 37. In Seminary, 64% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 90% of Seminary residents were born in Mississippi, 10% were born out of state, 0% were born outside of the United States and 0% were foreign born.