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2018 Colorado U.S. House District 4 Election

Colorado · 2 candidates · See every 2018 U.S. House race

Who won the 2018 Colorado U.S. House District 4 Election?

Ken Buck won the 2018 Colorado U.S. House District 4 Election. Ken Buck received 224,038 popular votes (60.62%). The main challenger was Karen McCormick (39.38%).

See the full head-to-head between Buck and McCormick

Buck +21.2 pts · won by 78,494 votes
Ken BuckRepublicanWINNER60.62%
224,038 votes
Karen McCormickDemocratic39.38%
145,544 votes
Popular-vote totals for U.S. House elections come from the MIT Election Data and Science Lab (1976–2024).

Data last verified July 28, 2026.