Colorado's 18th Senate district is one of 35 districts in the Colorado Senate. As of January 8, 2025 it is represented by Judy Amabile. It was previously represented by Democrat Steve Fenberg, the former Senate President, since 2017.
Geography District 18 is based in the city of Boulder, also covering the outlying Boulder County communities of Lyons, Nederland, Gunbarrel, and Niwot.
The district is located almost entirely within Colorado's 2nd congressional district, with a small section extending into the 4th district. It overlaps with the 10th, 11th, 12th, and 13th districts of the Colorado House of Representatives.
Recent election results Colorado state senators are elected to staggered four-year terms; under normal circumstances, the 18th district holds elections in presidential years.
2020
2016
2012
Federal and statewide results Year Office Results 2020 President Biden 83.6 – 14.4% 2018 Governor Polis 82.7 – 15.2% 2016 President Clinton 78.1 – 15.2% 2014 Senate Udall 77.5 – 19.4% Governor Hickenlooper 75.6 – 18.1% 2012 President Obama 76.5 – 21.0%
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