Westbrook is a city in Cumberland County, Maine, United States and a suburb of Portland. The population was 20,400 at the 2020 census, …Westbrook is a city in Cumberland County, Maine, United States and a suburb of Portland. The population was 20,400 at the 2020 census, making it the fastest-growing city in Maine between 2010 and 2020. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area.
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