Ione, WA has a population of 399 and is the 20,897th largest city in the United States. The population density is 744 per sq mi which is 670% higher than the Washington average and 722% higher than the national average. The median age in Ione is 48 which is approximately 27% higher than the Washington average of 38. In Ione, 60% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 57% of Ione residents were born in Washington, 42% were born out of state, 0% were born outside of the United States and 1% were foreign born.