Incumbent: Lauren Boebert · Republican
Greg Lopez (Republican Party) is running for election for Governor of Colorado. He will not appear on the ballot for the Republican primary on June 30, 2026. Lopez (Republican Party) was a member of the U.S. House, representing Colorado's 4th Congressional District. He assumed office on July 8, 2024. He left office on January 3, 2025.
Eileen Laubacher (Democratic Party) is running for election to the U.S. House to represent Colorado's 4th Congressional District. She is on the ballot in the Democratic primary on June 30, 2026.
Trisha Calvarese (Democratic Party) ran for election to the U.S. House to represent Colorado's 4th Congressional District. She will not appear on the ballot for the Democratic primary on June 30, 2026.
Lauren Boebert (Republican Party) is a member of the U.S. House, representing Colorado's 4th Congressional District. She assumed office on January 3, 2025. Her current term ends on January 3, 2027. Boebert (Republican Party) is running for re-election to the U.S. House to represent Colorado's 4th Congressional District. She is on the ballot in the Republican primary on June 30, 2026.
John Padora Jr.(Democratic Party) ran for election to the U.S. House to represent Colorado's 4th Congressional District. He will not appear on the ballot for the Democratic primary on June 30, 2026.
Jenna Preston (Democratic Party) is running for election to the U.S. House to represent Colorado's 4th Congressional District. She is on the ballot in the Democratic primary on June 30, 2026.
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Karen Breslin (Democratic Party) ran for election to the U.S. Senate to represent Colorado. She will not appear on the ballot for the Democratic primary on June 30, 2026.
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Ike McCorkle (Democratic Party) ran for election to the U.S. House to represent Colorado's 4th Congressional District. He lost in the Democratic primary on June 25, 2024.
Eric Phelan (Republican Party) ran for election to the U.S. House to represent Colorado's 4th Congressional District. Phelan will not appear on the ballot for the Republican primary on June 30, 2026.
Wayne Thornton (unaffiliated) is running for election to the U.S. House to represent Colorado's 4th Congressional District. He declared candidacy for the general election scheduled on November 3, 2026.
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Eric San Felipe (Republican Party) ran for election to the U.S. House to represent Colorado's 4th Congressional District. San Felipe will not appear on the ballot for the Republican primary on June 30, 2026.
Douglas Mangeris (Libertarian Party) is running for election to the U.S. House to represent Colorado's 4th Congressional District. He declared candidacy for the general election scheduled on November 3, 2026. Mangeris also ran for election to the Colorado House of Representatives to represent District 4. He will not appear on the ballot for the general election on November 3, 2026.
Anil Saxena (Democratic Party) ran for election to the U.S. House to represent Colorado's 4th Congressional District. He did not appear on the ballot for the Democratic primary on June 25, 2024.
Mariel Bailey (Republican Party) ran for election to the U.S. House to represent Colorado's 4th Congressional District. She did not appear on the ballot for the Republican primary on June 25, 2024.
Hannah Goodmanwas the Libertarian Party of Colorado Chair. She left office on October 24, 2025. Goodman (Libertarian Party) ran in a special election to the U.S. House to represent Colorado's 4th Congressional District. She lost in the special general election on June 25, 2024. Goodman also ran for election to the U.S. House to represent Colorado's 4th Congressional District. She lost in the general election on November 5, 2024.
Mark Elworth Jr.(unaffiliated) ran in a special election to the U.S. House to represent Colorado's 4th Congressional District. He did not appear on the ballot for the special general election on June 25, 2024. Elworth (Libertarian Party) also ran for election to the U.S. House to represent Colorado's 3rd Congressional District. He did not appear on the ballot for the general election on November 5, 2024.
Justin Schreiber (Republican Party) ran for election to the U.S. House to represent Colorado's 4th Congressional District. He did not appear on the ballot for the Republican primary on June 25, 2024.
James Treibert (independent) is running for election for President of the United States. He declared candidacy for the 2028 election.
