Lancaster, MN has a population of 387 and is the 21,053rd largest city in the United States. The population density is 166 per sq mi which is 168% higher than the Minnesota average and 83% higher than the national average. The median age in Lancaster is 43 which is approximately 12% higher than the Minnesota average of 38. In Lancaster, 80% of the population over 15 years of age are married, 93% speak English and 7% speak Spanish. 63% of Lancaster residents were born in Minnesota, 37% were born out of state, 0% were born outside of the United States and 1% were foreign born.