Carson Beach Postcards Carson Beach No. 509 Postcard. Caption on front: Carson Beach, Dorchester, Massachusetts. 1086. Postally unused. On verso: American Art Post Card Co., Boston, Mass. Carson Beach is actually in South Boston Facebook Twitter Print Friendly Skills Carson Beach, Dorchester, South Boston Posted on November 24, 2022 ← Dorchester, Mass. St. Margarets Church Uphams Corner →