About St. Catharines
St. Catharines is a city in Ontario, Canada with a population of 136,803. It is the 47th largest of the 295 cities of 15,000 or more listed in Canada, and the 4,164th largest worldwide. It lies 376 km from Ottawa.
Key Facts
Country
Region
Rank in region
#22of 100
Coordinates
43.171, -79.243
Record updated
12 December 2025
Entry edited, not measured
City population, GeoNames. GeoNames publishes no year for its population figures, so “record updated” is when the entry was last edited — not the date the population was measured. Elevation is modelled from a digital elevation model rather than surveyed, so it is approximate.
Nearby Cities
All 295 in CanadaClosest listed cities by great-circle distance from the city centre.