Colorado's 21st Senate district is one of 35 districts in the Colorado Senate. It is represented by represented by Democrat Adrienne Benavidez who was selected by a vacancy committee in February 2026 to succeed Democrat Dafna Michaelson Jenet.
Geography District 21 covers the immediate northern suburbs of Denver in Adams County, including Commerce City, Federal Heights, Berkley, Derby, Sherrelwood, Twin Lakes, Welby, parts of Shaw Heights and Westminster, and the eastern tip of Arvada.
The district is located entirely within Colorado's 7th congressional district, and overlaps with the 30th, 31st, 32nd, 34th, and 35th districts of the Colorado House of Representatives.
Recent election results Colorado state senators are elected to staggered four-year terms; under normal circumstances, the 21st district holds elections in presidential years.
2020
2016
2012
Federal and statewide results Year Office Results 2020 President Biden 62.2 – 34.8% 2018 Governor Polis 60.5 – 33.9% 2016 President Clinton 56.0 – 35.3% 2014 Senate Udall 54.1 – 37.5% Governor Hickenlooper 56.0 – 37.6% 2012 President Obama 64.5 – 32.7%
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