Chelsea is a city in Washtenaw County in the U.S. state of Michigan.

[4] The area was first settled as early as 1820 within the Michigan Territory by settler Cyrus Beckwith.

The Michigan Central Railroad constructed a line through the area in 1848, and a post office was first established on January 4, 1849.

The name was changed to Chelsea on July 19, 1850 when the train station opened and community was formally platted.

[5] The Chelsea courthouse is housed in a 120-year-old bank building in downtown.

[7] This climatic region has large, varying seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters.

37.2% of all households were made up of individuals, and 21.9% had someone living alone who was 65 years of age or older.

35.4% of all households were made up of individuals, and 19.7% had someone living alone who was 65 years of age or older.

Other employers include Saint Joseph Mercy Chelsea, and the Chrysler Proving Grounds.

The Chelsea District Library serves residents of the city and Dexter, Lima, Lyndon, and Sylvan townships.