Colorado Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of t ...

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

Colorado Senate The Colorado 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 about 123, ...

. It has been represented by

Republican Republican can refer to: Political ideology * An advocate of a republic, a type of government that is not a monarchy or dictatorship, and is usually associated with the rule of law. ** Republicanism, the ideology in support of republics or agains ...

Mark Baisley Mark Baisley (born 1955 in Hastings, Minnesota) is a state senator from Roxborough Park, Colorado. A Republican, Baisley represents Colorado's 4th Senate district. Previously, he represented Colorado House of Representatives District 39, which ...

since 2023. Prior to redistricting the district was represented by Republicans Jim Smallwood 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 Castle ...

Geography

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

Denver Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the Unit ...

, including

Castle Pines The City of Castle Pines is a home rule municipality located in Douglas County, Colorado, United States. The city population was 11,036 at the 2020 United States Census. Castle Pines is a part of the Denver–Aurora–Lakewood, CO Metropolitan ...

, Castle Rock, Larkspur,

Parker Parker may refer to: Persons * Parker (given name) * Parker (surname) Places Place names in the United States *Parker, Arizona *Parker, Colorado * Parker, Florida * Parker, Idaho * Parker, Kansas * Parker, Missouri * Parker, North Carolina *Park ...

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

Aurora An aurora (plural: auroras or aurorae), also commonly known as the polar lights, is a natural light display in Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras display dynamic patterns of bri ...

. 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'' (1972 film), a Sovie ...

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 distr ...

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 Jim Smallwood was redistricted to the 2nd district, which isn't up until 2024, and State Rep.

Geography

Recent election results

2022

Historical election results

2020

2016

2012

Federal and statewide results

References