High Quality Content by WIKIPEDIA articles! Portland is a town in Middlesex County, Connecticut, United States. The population was 8,732 at the 2000 census. The town center is listed as a census-designated place (CDP). It is situated across the Connecticut River from Middletown. Brownstone quarried in Portland was used in the construction of Hartford`s Old State House in 1796. The vast majority of the brownstone buildings in Connecticut (see College Row at Wesleyan University and the Long Walk at Trinity College) as well as the famous brownstones in New York City were built with brownstone from Portland`s quarries.