St. Catharines has a population of 136,803, making it the 47th largest place we list in Canada. It is in Ontario.
St. Catharines holds 0.34% of Canada's 40,467,728 people. Toronto, the largest place we list there, is 20 times its size.
136,803
population
#47
in Canada
Nearby in size
| Place | Region | Population |
|---|---|---|
| Mercier–Hochelaga-Maisonneuve | Quebec | 142,753 |
| Abbotsford | British Columbia | 141,397 |
| Whitby | Ontario | 138,501 |
| Milton | Ontario | 132,979 |
| Langley | British Columbia | 132,603 |
| Kingston | Ontario | 132,485 |
Figures are the latest available in GeoNames (CC BY 4.0), which draws on national censuses of varying dates — treat them as recent, not same-year. Country totals are UN World Population Prospects 2024 (medium variant) where the UN lists the country separately; the handful it reports under a parent state keep a GeoNames figure and are marked as such. Sources & method.