📌 The Canadian federal electoral district of Markham—Unionville was contested in the 2004 election.

🏆 John McCallum, the Liberal candidate, won the riding with 30,266 votes (66.4% of the vote).

🥈 The runner-up was Joe Li (Conservative) with 10,225 votes (22.4%), defeated by a margin of 20,041 votes.

📊 Other notable candidates: Janice Hagan (N.D.P., 9%).