Stewartville, MN has a population of 5,990 and is the 5,715th largest city in the United States. The population density is 1,937 per sq mi which is 2808% higher than the Minnesota average and 2038% higher than the national average. The median age in Stewartville is 35 which is approximately 6% lower than the Minnesota average of 38. In Stewartville, 66% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 74% of Stewartville residents were born in Minnesota, 23% were born out of state, 0% were born outside of the United States and 2% were foreign born.