Cornwall county has been administered since 2009 by the unitary authority, Cornwall Council. The ceremonial county of Cornwall also includes the Isles of Scilly, which are administered separately. The administrative centre of Cornwall, and its only city, is Truro. Cornwall is the homeland of the Cornish people and the cultural and ethnic origin of the Cornish diaspora. It retains a distinct cultural identity that reflects its unique history, and is recognised as one of the Celtic nations with a rich cultural heritage. It was formerly a Brythonic kingdom and subsequently a royal duchy. The Cornish nationalist movement contests the present constitutional
Cornwall, California became part of the Southern Pacific system in 1888). The coal railroad crossed the San Pablo and Tulare line using an overhead trestle. A post office operated at Cornwall Station from 1881 to 1888. Cornwall post office operated from 1890 to 1911. The Cornwall area, together with the nearby town of Black Diamond, was officially renamed "Pittsburg" on February 11, 1911, which may explain why the Cornwall Post Office stopped operations in that same year. Cornwall, California Cornwall, formerly known as Cornwall Station, was an unincorporated community in Contra Costa County, California, before it was absorbed into the City of