Marion Township, Buchanan County, Missouri  Marion Township is one of twelve townships in Buchanan County, Missouri, USA. As of the 2000 census, its population was 1,226. Marion Township was established in 1837. Marion Township covers an area of and contains one incorporated settlement, Easton. It contains eight cemeteries: Blakely, Bowen, Courtney, Kessler, Minor, Moxley, Saint Josephs and Saint Marys. The streams of Becks Branch, James Branch, Little Third Fork, Muddy Creek, One Hundred and Two River and Third Fork run through this township.