Saco, ME has a population of 19,008 and is the 2,295th largest city in the United States. The population density is 494 per sq mi which is 1216% higher than the Maine average and 445% higher than the national average. The median age in Saco is 43 which is approximately 3% lower than the Maine average of 44. In Saco, 57% of the population over 15 years of age are married, 89% speak English and 1% speak Spanish. 65% of Saco residents were born in Maine, 28% were born out of state, 1% were born outside of the United States and 5% were foreign born.