Colorado Colorado is a U.S. state, state in the Western United States. It is one of the Mountain states, sharing the Four Corners region with Arizona, New Mexico, and Utah. It is also bordered by Wyoming to the north, Nebraska to the northeast, Kansas ...

's 4th Senate district is one of 35 districts in the

Colorado Senate The Colorado State Senate is the upper house of the Colorado General Assembly, the state legislature of the US state of Colorado. It is composed of 35 members elected from single-member districts, with each district having a population of abou ...

. It has been represented by Republican Mark Baisley since 2023. Prior to redistricting the district was represented by Republicans

Jim Smallwood James Smallwood Jr. (born ) is an American business consultant and politician first elected to the Colorado Senate in 2016. From 2023 to 2025, he represented Colorado's 2nd Senate district, State Senate District 2, which includes the communiti ...

and

Mark Scheffel Mark Scheffel is an American politician and a former Majority Leader of the Colorado Senate. First elected to the Colorado State Senate as a Republican in 2008, Scheffel represented Senate District 4 in Douglas County, which encompasses Castl ...

Geography

District 4 is based in Douglas County on the southern outskirts of

Denver Denver ( ) is a List of municipalities in Colorado#Consolidated city and county, consolidated city and county, the List of capitals in the United States, capital and List of municipalities in Colorado, most populous city of the U.S. state of ...

, including Castle Pines,

Castle Rock Castle Rock may refer to: Geography Islands * Castle Rock (Alaska), an island off the coast of the U.S. state of Alaska * Castle Rock, Hong Kong, an island of Hong Kong, part of the Po Toi Islands * Castle Rock (Massachusetts), an island in th ...

, Larkspur,

Parker Parker may refer to: People * Parker (given name), including a list of people and fictional characters with the given name * Parker (surname), including a list of people and fictional characters with the surname Arts and entertainment * ''Parke ...

, Perry Park, The Pinery, and the southern tip of

Aurora An aurora ( aurorae or auroras), also commonly known as the northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in Earth's sky, predominantly observed in high-latitude regions (around the Arc ...

. The district overlaps with Colorado's

4th Fourth or the fourth may refer to: * the ordinal form of the number 4 * ''Fourth'' (album), by Soft Machine, 1971 * Fourth (angle), an ancient astronomical subdivision * Fourth (music), a musical interval * ''The Fourth'', a 1972 Soviet drama ...

and 6th congressional districts, and with the 39th, 44th, and 45th districts of the

Colorado House of Representatives The Colorado House of Representatives is the lower house of the Colorado General Assembly, the state legislature of the U.S. state of Colorado. The House is composed of 65 members from an equal number of constituent districts, with each distri ...

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.

Recent election results

Colorado state senators are elected to staggered four-year terms. The old 4th district held elections in presidential years, but the new district drawn following the 2020 Census will hold elections in midterm years.

2022

The 2022 election will be the first one held under the state's new district lines. Incumbent Senator

was redistricted to the 2nd district, which isn't up until 2024, and State Rep. Mark Baisley is running for the 4th district instead.

Geography

Composition and elections

Recent election results

2022

Historical election results

2020

2016

2012

Federal and statewide results

References