The Winthrop July 4th Fireworks display would not be possible without sponsors, donors and supportive residents. Please donate any amount is greatly appreciated. Checks can be mailed to: Town of Winthrop Fireworks, 40 Pauline Street, Winthrop, MA 02152. Chief Paul Flanagan and is crew thank you. The July 4th fireworks will be on the 4th at approximately 9:15 PM.