Markham—Thornhill is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 2015. It encompasses a portion of Ontario previously included in the electoral districts of Markham—Unionville and Thornhill.^[3]

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Markham—Thornhill

Ontario electoral district
Markham—Thornhill in relation to other Greater Toronto Area districts
Federal electoral district
Legislature	House of Commons
MP	Mary Ng Liberal
District created	2013
First contested	2015
Last contested	2021
District webpage	profile, map
Demographics
Population (2021)[1]	97,510
Electors (2015)	70,211
Area (km²)[2]	44
Pop. density (per km²)	2,216.1
Census division(s)	York
Census subdivision(s)	Markham

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Markham—Thornhill was created by 2012 federal electoral boundaries redistribution and was legally defined in the 2013 representation order. It came into effect upon the dropping of the writs for the 2015 federal election.^[4]

Markham—Thornhill loses more people than any other federal electoral district in the 905 region. The population in 2016 was 99,078 which is a 3.1% drop from 102,221 in 2011.

According to the 2021 Canadian census^[5]

Ethnic groups: 42.8% Chinese, 27.5% South Asian, 12.7% White, 3.8% Black, 2.7% Filipino, 3.0% West Asian, 1.3% Korean
Languages: 29.5% English, 18.7% Cantonese, 13.8% Mandarin, 7.6% Tamil, 3.1% Urdu, 2.3% Punjabi, 2.0% Persian, 1.9% Gujarati, 1.3% Tagalog, 1.0% Korean
Religions: 28.2% Christian (13.5% Catholic, 2.4% Christian Orthodox, 1.0% Anglican, 11.3% other), 14.3% Hindu, 10.8% Muslim, 4.7% Buddhist, 3.1% Jewish, 2.2% Sikh, 36.1% none
Median income: $32,400 (2020)
Average income: $47,640 (2020)

This riding has elected the following members of Parliament:

• Markham—Thornhill (provincial electoral district)