About Thornhill
Thornhill is a city in Ontario, Canada with a population of 115,292. It is the 58th largest of the 295 cities of 15,000 or more listed in Canada, and the 5,000th largest worldwide. It lies 344 km from Ottawa.
Key Facts
Country
Region
Rank in region
#29of 100
Coordinates
43.815, -79.424
Record updated
26 July 2026
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.
Nearby Cities
All 295 in CanadaClosest listed cities by great-circle distance from the city centre.