Estherville, IA has a population of 6,027 and is the 5,746th largest city in the United States. The population density is 1,124 per sq mi which is 1957% higher than the Iowa average and 1140% higher than the national average. The median age in Estherville is 38 which is approximately 1% lower than the Iowa average of 38. In Estherville, 59% of the population over 15 years of age are married, 88% speak English and 12% speak Spanish. 63% of Estherville residents were born in Iowa, 29% were born out of state, 2% were born outside of the United States and 6% were foreign born.