The province accounts for seven of the 338 seats in the House of Commons. The Liberals of Prime Minister Justin Trudeau, who are seeking re-election, won all seven in the 2015 election that brought the party to power.
With six time zones stretching across the country, voting stations close at different times. The last to close are those in the Pacific province of British Columbia, which will shut at 10 p.m. EDT (0200 GMT Tuesday).