Arthur, IA has a population of 254 and is the 23,346th largest city in the United States. The population density is 1,671 per sq mi which is 2959% higher than the Iowa average and 1744% higher than the national average. The median age in Arthur is 46 which is approximately 22% higher than the Iowa average of 38. In Arthur, 71% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 80% of Arthur residents were born in Iowa, 19% were born out of state, 0% were born outside of the United States and 0% were foreign born.