Quincy is a coastal U.S. city in Norfolk County, Massachusetts, United States. It is the largest city in the county and a part of Metropolitan Boston as one of Boston's immediate southern suburbs. Its population in 2020 was 101,636, making it the seventh-largest city in the state. Known as the "City of Presidents", Quincy is the birthplace of two U.S. presidents—John Adams and his son John Quincy Adams—as well as John Hancock, the first signer of the Declaration of Independence and the first and third governor of Massachusetts.

Norfolk County is located in the U.S. state of Massachusetts. At the 2020 census, the population was 725,981. Its county seat is Dedham. It is the fourth most populous county in the United States whose county seat is neither a city nor a borough, and it is the second most populous county that has a county seat at a town. The county was named after the English county of the same name. Two towns, Cohasset and Brookline, are exclaves.