Casco, ME has a population of 750 and is the 17,048th largest city in the United States. The population density is 228 per sq mi which is 508% higher than the Maine average and 152% higher than the national average. The median age in Casco is 40 which is approximately 9% lower than the Maine average of 44. In Casco, 49% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 73% of Casco residents were born in Maine, 24% were born out of state, 1% were born outside of the United States and 1% were foreign born.