Farmington, IA has a population of 961 and is the 15,408th largest city in the United States. The population density is 2,051 per sq mi which is 3654% higher than the Iowa average and 2164% higher than the national average. The median age in Farmington is 36 which is approximately 6% lower than the Iowa average of 38. In Farmington, 64% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 77% of Farmington residents were born in Iowa, 21% were born out of state, 0% were born outside of the United States and 2% were foreign born.