Colorado's 4th Senate district
Colorado's 4th Senate district is one of 35 districts in the Colorado Senate. It has been represented by Republican Mark Baisley since 2023. Prior to redistricting the district was represented by Republicans Jim Smallwood and Mark Scheffel.
Geography
District 4 is based in Douglas County on the southern outskirts of Denver, including Castle Pines, Castle Rock, Larkspur, Parker, Perry Park, The Pinery, and the southern tip of Aurora.The district overlaps with Colorado's 4th and 6th congressional districts, and with the 39th, 44th, and 45th districts of the Colorado House of Representatives.
Composition and elections
Colorado State Senate members serve four-year terms, limited to two terms. Constitutional qualifications require senators to be U.S. citizens, at least 25 years old, and state residents for at least 12 months before election.As of 2024, annual salaries were set at $43,977 for members elected after 2021, with additional per diem allowances determined by proximity to the state capitol. Vacancies are filled through appointments by the political party of the previous officeholder. Following the 2020 census, district boundaries were reconfigured by an independent redistricting commission in accordance with state constitutional guidelines for geographic compactness and preservation of municipal boundaries.