Cousins Island, ME has a population of 659 and is the 17,834th largest city in the United States. The population density is 621 per sq mi which is 1554% higher than the Maine average and 586% higher than the national average. The median age in Cousins Island is 49 which is approximately 12% higher than the Maine average of 44. In Cousins Island, 74% of the population over 15 years of age are married, 93% speak English and 0% speak Spanish. 39% of Cousins Island residents were born in Maine, 55% were born out of state, 2% were born outside of the United States and 3% were foreign born.