High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Loudon Township is one of the fifteen townships of Seneca County, Ohio, United States. The 2000 census found 2,395 people in the township. Part of the city of Fostoria is located in northwestern Loudon Township. Statewide, the only other Loudon Township is located in Carroll County. The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1.