[2][3] It is on the Trent River and was created in 2001 through the amalgamation of the municipalities of Campbellford/Seymour, Percy Township, and Hastings Village.

The municipality was historically four separate administrative subdivisions: the former town of Campbellford; the former village of Hastings; Seymour Township; and Percy Township.

[4] There are three main population centres in Trent Hills: Campbellford; Hastings; and the former village of Warkworth, formerly the municipal seat of Percy Township prior to the amalgamation of Trent Hills.

[1] Mother tongue (2021):[1] The chart below shows the structure of the municipal government of Trent Hills.

[10] The Member of Parliament for the riding of Northumberland—Peterborough South is Philip Lawrence of the Conservative Party of Canada.