Chelsea is a city in Suffolk County, Massachusetts, United States, which sits across the Mystic River from Boston. The 2020 census reported …Chelsea is a city in Suffolk County, Massachusetts, United States, which sits across the Mystic River from Boston. The 2020 census reported Chelsea as having a population of 40,787, thereby making it the second most densely populated city in Massachusetts. With a total area of 2.46 square miles, Chelsea is the smallest city in Massachusetts in terms of total area.
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