Texas Township in Lyon County, Iowa, United States Centennial Township is a township in Lyon County, Iowa, United States.[1] References ^ U.S. Geological Survey Geographic Names Information System: Centennial Township, Lyon County, Iowa Municipalities and communities of Lyon County, Iowa, United StatesCounty seat: Rock RapidsCities Alvord Doon George Inwood Larchwood Lester Little Rock Rock Rapids Map of Iowa highlighting Lyon CountyUnincorporatedcommunities Beloit Edna Granite Ghost town Lakewood Iowa portal United States portal 43°23′N 96°30′W / 43.383°N 96.500°W / 43.383; -96.500