Chelsea Massachusetts

    • Country: USA
    • Population: 38,203
    • State/Province: MA
    • Founded: 1739
    • Area code: 02150
    • Time zone: ET
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  • Chelsea is a city in Suffolk County, Massachusetts, United States directly across the Mystic River from the city of Boston. It is the smallest city in Massachusetts in land area, and the 26th most densely populated incorporated place in the country.