South Portland is a city located in Cumberland County, Maine, in the United States. Incorporated in 1898, it currently stands as the fourth-most populous city in the state, with a population of 26,498 recorded during the 2020 census.
The city is situated on Portland Harbor and is characterized by its working waterfront, which overlooks the skyline of Portland and the surrounding islands of Casco Bay. Due to its proximity to air, marine, rail, and highway transportation networks, South Portland serves as a regional center for industry and retail. Notable landmarks include the Maine Mall, the largest shopping mall in the state, and the city is also designated as a Tree City USA community.