Newmarket is a town and regional seat of the Regional Municipality of York in the Canadian province of Ontario. It is part of Greater Toronto in the Golden Horseshoe region of Southern Ontario. The name stems from the fact that the settlement was a "New Market" in contrast to York as the Old Market.

Aurora is a town in central York Region in the Greater Toronto Area, within the Golden Horseshoe of Southern Ontario, Canada. It is located north of the City of Richmond Hill and is partially situated on the Oak Ridges Moraine. In the Canada 2021 Census, the municipal population of Aurora was the 92nd largest in Canada, compared to 95th for the 2016 Census and 97th for the 2006 Census. Aurora is twinned with Leksand, Sweden.

Georgina is a town in south-central Ontario, and the northernmost municipality in the Regional Municipality of York. The town is bounded to the north by Lake Simcoe. Although incorporated as a town, it operates as a township in which dispersed communities share a common administrative council. The largest communities are Keswick, Sutton and Jackson's Point. Smaller communities include Pefferlaw, Port Bolster, Roches Point, Udora and Willow Beach.

East Gwillimbury is a town on the East Holland River in the upper-tier municipality the Regional Municipality of York. It is part of the Greater Toronto Area of southern Ontario, in Canada. It was formed by the amalgamation of the Township of East Gwillimbury with all the previously incorporated villages and hamlets within the township. The main centres in East Gwillimbury are the villages of Holland Landing, Queensville, Sharon, and Mount Albert. The Civic Centre are located along Leslie Street in Sharon.

Markham is a city in the Regional Municipality of York, Ontario, Canada. It is approximately 30 km northeast of Downtown Toronto. In the 2021 Census, Markham had a population of 338,503. which ranked it the largest in York Region, fourth largest in the Greater Toronto Area, and 16th largest in Canada.

Richmond Hill is a city in south-central York Region, Ontario, Canada. Part of the Greater Toronto Area, it is the York Region's third most populous municipality and the 27th most populous municipality in Canada.

Scarborough is a district of Toronto, Ontario, Canada. It is situated atop the Scarborough Bluffs in the eastern part of the city. Its borders are Victoria Park Avenue to the west, Steeles Avenue and the city of Markham to the north, Rouge River and the city of Pickering to the east, and Lake Ontario to the south. Scarborough was named after the English town of Scarborough, North Yorkshire, inspired by its cliffs.

Vaughan is a city in Ontario, Canada. It is located in the Regional Municipality of York, just north of Toronto. Vaughan was the fastest-growing municipality in Canada between 1996 and 2006 with its population increasing by 80.2% during this time period and having nearly doubled in population since 1991. It is the fifth-largest city in the Greater Toronto Area, and the 17th-largest city in Canada.