St. Joseph, MN has a population of 6,775 and is the 5,297th largest city in the United States. The population density is 1,722 per sq mi which is 2683% higher than the Minnesota average and 1800% higher than the national average. The median age in St. Joseph is 22 which is approximately 42% lower than the Minnesota average of 38. In St. Joseph, 33% of the population over 15 years of age are married, 93% speak English and 1% speak Spanish. 77% of St. Joseph residents were born in Minnesota, 17% were born out of state, 0% were born outside of the United States and 6% were foreign born.