The riding of Hamilton West - Ancaster - Dundas is made up of four regions.
West Hamilton (Lower City)
Includes the neighbourhoods of Ainslie wood and Westdale, as well as McMaster University and the McMaster Children's Hospital. Overlaps with Hamilton's Ward One.
West Hamilton (Mountain)
Includes the communities on the West Mountain West of Garth st. and North of the Linc, and the communities West of West 5th St. between the Linc and Rymal Road. Overlaps with Hamilton's Ward 7 and 14.
Ancaster
Includes the old city of Ancaster, its exurbs, as well as the Meadowlands . Overlaps with Hamilton's Ward 12.
Dundas
Includes the old city of Dundas, it's exurbs, and the University Gardens neighbourhood. Overlaps with Hamilton's Ward 13.
Boundaries description
Consisting of that part of the City of Hamilton described as follows: commencing at the intersection of the northerly limit of said city with Highway No. 403; thence southwesterly along said highway to the Canadian National Railway; thence generally westerly along said railway to Highway No. 52 North; thence generally southerly along said highway and Trinity Road to the electric power transmission line situated northerly of Book Road West; thence generally easterly along said transmission line to Glancaster Road; thence northerly along said road to Garner Road East; thence easterly along said road and Rymal Road West to Garth Street; thence northerly along said street to Lincoln M. Alexander Parkway; thence easterly along said parkway to West 5th Street; thence northerly along said street to James Mountain Road; thence generally northeasterly along said road to the Niagara Escarpment; thence generally westerly along said escarpment to the electric power transmission line situated westerly of Chateau Court; thence northerly along said transmission line to Highway No. 403; thence generally northeasterly along said highway to the Desjardins Canal; thence easterly along said canal and continuing due east in Hamilton Harbour to the northerly production of Queen Street North; thence northerly in a straight line along said production to the northerly limit of said city; thence generally westerly along said limit to the point of commencement.