Belfast is a city in Waldo County, Maine, in the United States. Located at the mouth of the Passagassawakeag River on Penobscot Bay, Belfast is the county seat of Waldo County. The seaport has a wealth of antique architecture in several historic districts, and remains popular with tourists. Following the war, the seaport rebuilt and thrived. It was a port of entry, and designated county seat of Waldo County in 1827, although land would be set off in 1845 to form part of Searsport. Belfast was incorporated in 1853 as a city, the 8th in Maine. It developed into a shipbuilding center, producing hundreds of three, four and five masted schooners. Materials for wooden boat construction were shipped down the Penobscot River from Bangor, the lumber capital of North America during the later 19th century.