Regional Municipality of Halton
In 1974, the present municipal structure was created when the Regional Municipality of Halton replaced Halton County. The new town of Milton added parts of the former township of Esquesing (most of this township comprises Halton Hills), all of Nassagaweya Township including the village of Campbellville, and the northern sections of Trafalgar and Nelson from (a 1962 annexation of the former townships) Oakville and Burlington respectively.