Blue Earth, MN has a population of 3,254 and is the 8,400th largest city in the United States. The population density is 1,026 per sq mi which is 1558% higher than the Minnesota average and 1032% higher than the national average. The median age in Blue Earth is 50 which is approximately 33% higher than the Minnesota average of 38. In Blue Earth, 57% of the population over 15 years of age are married, 93% speak English and 7% speak Spanish. 73% of Blue Earth residents were born in Minnesota, 25% were born out of state, 0% were born outside of the United States and 3% were foreign born.