Welcome to the City of South Portland 25 Cottage Road, South Portland, Maine 04106 (207)767-3201 South Portland is the fourth largest City in the State of Maine with a population of 23, 324. The City operates under a charter initially adopted December 5, 1898, as amended, most recently in November of 1997, providing for a Council-Manager form of government with a seven-member City Council. The ...