Chelsea is a city in Suffolk County, Massachusetts. It is directly across the Mystic River from the city of Boston. As of July 1, 2016, the estimated population of Chelsea was 39,699.
Chelsea is a diverse working-class community. It has a lot of industrial activity. It is one of only three Massaschusetts cities in which most of the people are Hispanic or Latino. (The other two are Lawrence and Holyoke.)