Greater Toronto and Hamilton Area

The Greater Toronto and Hamilton Area (GTHA) is a contiguous urban region that is composed of some of the largest cities and metropolitan areas by population in Ontario, Canada. The GTHA consists of the City of Hamilton, Halton region, Peel region, the City of Toronto, York region, and Durham region.

Hamilton, though bordering Toronto's suburbs, is outside the Greater Toronto Area (GTA). The GTA population is 6,417,516 (2016 census). Beginning in the late-2000s, the term "Greater Toronto and Hamilton Area" was introduced by a few public bodies^a to refer to the GTA plus the former Regional Municipality of Hamilton-Wentworth. The population of the combined area is 7,165,061 as of 2016, and is projected to grow to 8.6 million by 2031.