2006 Colorado Amendment 43

Amendment 43

November 7, 2006
Definition of Marriage Initiative
Results
Choice
Votes  %
Yes 855,206 55.02%
No 699,030 44.98%
Valid votes 1,554,236 97.99%
Invalid or blank votes 31,869 2.01%
Total votes 1,586,105 100.00%
Registered voters/turnout 2,533,058 62.6%

Source:

Colorado Amendment 43 was a referendum approved by the voters in 2006 that added a new section to Article II of the Colorado Constitution to define marriage in Colorado as only a union between one man and one woman. It passed with 55% of votes. In November 2024, over 64% of Colorado voters called Amendment J repealed the 2006 anti-gay clause within the state constitution.