In 1924 the federal electoral district of Grenville was abolished when the county's riding was amalgamated with that of Dundas to become a new district known as Grenville-Dundas. In 1925 a federal election was held to determine who would be the first representative for the new electoral district in the House of Commons.
In 1924, the federal electoral district of Grenville was dissolved when the county's constituency merged with Dundas to form a new district called Grenville-Dundas. In 1925, an election took place to choose the first representative for the newly created electoral district in the House of Commons.