The 2nd Congressional district of Colorado is located in north-central Colorado, encompassing areas northwest of Denver, including the city of Boulder. It is represented in the 110th Congress by Democrat Mark Udall.
Following the 1990 U.S. census and associated realignment of Colorado congressional districts, the 2nd Congressional district consisted of Boulder, Clear Creek, and Gilpin counties, as well as portions of Adams, and Jefferson counties.
Following the 2000 U.S. census and associated realignment of Colorado congressional districts, the 2nd Congressional district consisted of Broomfield, Clear Creek, Eagle, Gilpin, Grand, and Summit counties, as well as portions of Adams, Boulder, Jefferson, and Weld counties.
|53rd-57th (1893-1903)||John Calhoun Bell||Populist|
|58th-59th (1903-1907)||Franklin Eli Brooks||Republican|
|60th (1907-1909)||George Washington Cook|
|61st-62nd (1909-1913)||John Andrew Martin||Democrat|
|63rd (1913-1915)||Harry Hunter Seldomridge|
|64th-72nd (1915-1933)||Charles Bateman Timberlake||Republican|
|73rd-76th (1933-1941)||Fred Nelson Cummings||Democrat|
|77th-85th (1941-1959)||William Silas Hill||Republican|
|86th (1959-1961)||Byron Johnson||Democrat|
|87th (1961-1963)||Pete Dominick||Republican|
|88th (1963-1965)||Don Brotzman|
|89th (1965-1967)||Roy McVicker||Democrat|
|90th-93rd (1967-1975)||Don Brotzman||Republican|
|94th-99th (1975-1987)||Tim Wirth||Democrat|
|100th-105th (1987-1999)||David Skaggs|
|106th-110th (1999-2009)||Mark Udall|