It consisted of the township of Hibbert in the county of Perth, and the townships of Hullett, McKillop, Stanley, Tuckersmith, Hay, Stephen, Usborne, Grey, Morris, Colborne, Goderich, Ashfield, East Wawanosh and West Wawanosh in the county of Huron.

In 1966, it was redefined to consist of the County of Huron excluding the Village of Lucknow, and the Village of Ailsa Craig and the Townships of Biddulph and McGillivray in the County of Middlesex.

In 1976, it was renamed "Huron—Bruce", and defined to consist of the County of Huron and the Townships of Carrick, Culross, Huron and Kinloss in the County of Bruce.

In 1987, the Bruce County portion was redefined as the part of the County of Bruce lying west of and excluding the townships of Carrick, Brant and Elderslie, west of and including the Village of Paisley, west of and excluding the Townships of Elderslie and Arran, and west of and including the Township of Saugeen and the Town of Southampton.

In 2003, the Bruce County portion was redefined as the part of the County of Bruce lying southwest of and excluding the Township of Arran-Elderslie, and west of and including the Town of Saugeen Shores.