Arco, MN has a population of 107 and is the 26,738th 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 Arco is 51 which is approximately 35% higher than the Minnesota average of 38. In Arco, 53% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 93% of Arco residents were born in Minnesota, 7% were born out of state, 0% were born outside of the United States and 0% were foreign born.