North Washington, IA has a population of 161 and is the 25,367th largest city in the United States. The population density is 810 per sq mi which is 1383% higher than the Iowa average and 794% higher than the national average. The median age in North Washington is 41 which is approximately 8% higher than the Iowa average of 38. In North Washington, 62% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 85% of North Washington residents were born in Iowa, 11% were born out of state, 0% were born outside of the United States and 4% were foreign born.