Winthrop is a city in Suffolk County, Massachusetts, United States. The population was 17,497 at the 2010 census and as of 2019 the population has grown to an estimated 18,544. Winthrop is an ocean-side suburban community in Greater Boston situated at the north entrance to Boston Harbor, close to Logan International Airport. It is located on a peninsula, 1.6 square miles in area, connected to Revere by a narrow isthmus and to East Boston by a bridge... Show more

source