Variant of Standard Geographical Classification (SGC) 2021 for Economic Regions
- 3 - Ontario
- 35 - Ontario
- 3550-ER - Hamilton--Niagara Peninsula
- 3524H - Halton (Hamilton--Niagara Peninsula part)
- 3524002 - Burlington
- 3525 - Hamilton
- 3525005 - Hamilton
- 3526 - Niagara
- 3526003 - Fort Erie
- 3526011 - Port Colborne
- 3526014 - Wainfleet
- 3526021 - West Lincoln
- 3526028 - Pelham
- 3526032 - Welland
- 3526037 - Thorold
- 3526043 - Niagara Falls
- 3526047 - Niagara-on-the-Lake
- 3526053 - St. Catharines
- 3526057 - Lincoln
- 3526065 - Grimsby
- 3528 - Haldimand-Norfolk
- 3528018 - Haldimand County
- 3528035 - New Credit (Part) 40A
- 3528037 - Six Nations (Part) 40
- 3528052 - Norfolk County
- 3529 - Brant
- 3529005 - Brant
- 3529006 - Brantford
- 3529020 - Six Nations (Part) 40
- 3529021 - New Credit (Part) 40A
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