(2) Antique Postcard of Belfast, Maine, circa pre-1907. Identified as a scene from the harbor, and a residential view. Undivided back, unused. Condition: These are original antique postcards, not a copy or reproduction. They are in excellent condition. Comments: Belfast is a city in Waldo County, Maine, in the United States. As of the 2020 census, the city population was 6,938. Located at the mouth of the Passagassawakeag River estuary on Belfast Bay and Penobscot Bay. Belfast is the county seat of Waldo County. Its seaport has a wealth of antique architecture in several historic districts, and remains popular with tourists.