Arnolds Park, IA has a population of 1,024 and is the 14,999th largest city in the United States. The population density is 647 per sq mi which is 1084% higher than the Iowa average and 614% higher than the national average. The median age in Arnolds Park is 46 which is approximately 21% higher than the Iowa average of 38. In Arnolds Park, 56% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 67% of Arnolds Park residents were born in Iowa, 32% were born out of state, 0% were born outside of the United States and 0% were foreign born.