Chelsea, Massachusetts, is a city located across the Mystic River from Boston. Chelsea was first settled in 1624 and incorporated as a city in 1857. It has approximately 35,000 residents in 1.8 square miles. The 26th most densely populated incorporated place in the country, its measured land area makes it the smallest city in Massachusetts.
Massachusetts is in the New England region of the U.S. It shares borders with the Atlantic Ocean, Connecticut, Rhode Island, New Hampshire, Vermont, and New York. Boston is the capital and the most populous city, with about 7,033,469 residents. It is the seventh-smallest state spanning only 10,555 square miles, 25.7% of which is water.