East Boston, nicknamed Eastie, is a neighborhood of Boston, Massachusetts, United States, which was annexed by the city of Boston in 1637. Neighboring communities include Winthrop, Revere, and Chelsea. It is separated from the Boston neighborhood of Charlestown and downtown Boston by Boston Harbor. The footprint of the East Boston neighborhood as it is known today was created in the 1940s by connecting five of the inner harbor islands using land fill.