Herron Island, WA has a population of 67 and is the 27,737th largest city in the United States. The population density is 141 per sq mi which is 46% higher than the Washington average and 55% higher than the national average. The median age in Herron Island is 74 which is approximately 97% higher than the Washington average of 38. In Herron Island, 90% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 39% of Herron Island residents were born in Washington, 61% were born out of state, 0% were born outside of the United States and 0% were foreign born.