European settlement began in earnest in the 1830s and brothers Lieutenant-Colonel Robert Campbell and Major Robert Campbell were granted 890 acres (360 ha) on the Trent River in 1831. A settlement grew, and in 1876, the Village of Campbellford was separated from Seymour and incorporated as a separate municipality.
Seymour was originally part of the United Counties of Northumberland and Durham, then Northumberland after the United Counties were restructured in 1974. In 2001, Seymour was amalgamated with Campbellford, the Village of Hastings and Percy Township to form the Town of Campbellford / Seymour, Percy & Hastings. It was renamed Trent Hills later that year. According to the 2001 Census, Seymour had a population of 4,528 at the time of amalgamation.
- "Seymour". Geographical Names Data Base. Natural Resources Canada. Retrieved 2014-05-10.
- "Township of Seymour" (JPG). Canadian County Atlas Project. McGill University. 2001. Retrieved 2014-05-10.
- Restructured municipalities - Ontario map #5 (Map). Restructuring Maps of Ontario. Ontario Ministry of Municipal Affairs and Housing. 2006. Retrieved 2014-05-10.
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