| U.S. same-sex unions ballot measures |
|---|
| 1990s |
|
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| 2000s |
- California Proposition 22 (2000, ban)
- Nebraska Initiative 416 (2000, ban)
- Nevada Ballot Question 2 (2000 & 2002, ban)
- Missouri Constitutional Amendment 2 (2004, ban)
- Louisiana Constitutional Amendment 1 (2004, ban)
- Georgia Constitutional Amendment 1 (2004, ban)
- Kentucky Constitutional Amendment 1 (2004, ban)
- Ohio State Issue 1 (2004, ban)
- Mississippi Amendment 1 (2004, ban)
- Oklahoma State Question 711 (2004, ban)
- Arkansas Constitutional Amendment 3 (2004, ban)
- Michigan Proposal 04-2 (2004, ban)
- Montana Initiative 96 (2004, ban)
- Utah Constitutional Amendment 3 (2004, ban)
- North Dakota Constitutional Measure 1 (2004, ban)
- Oregon Ballot Measure 36 (2004, ban)
- Kansas Amendment 1 (2005)
- Texas Proposition 2 (2005, ban)
- Alabama Amendment 774 (2006)
- South Carolina Amendment 1 (2006, ban)
- Virginia Question 1 (2006, ban)
- Tennessee Amendment 1 (2006, ban)
- Wisconsin Referendum 1 (2006, ban)
- Arizona Proposition 107 (2006, constitutional ban defeated)
- Colorado Amendment 43 (2006, ban)
- South Dakota Amendment C (2006)
- Idaho Amendment 2 (2006, ban)
- Florida Amendment 2 (2008, ban)
- Arizona Proposition 102 (2008, ban)
- California Proposition 8 (2008, ban)
- Maine Question 1 (2009, legalizing legislation defeated)
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| 2010s |
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| 2020s |
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| : De facto ban, granted Legislature authority to ban same-sex marriage. Reversed in 2013 by the Hawaii Marriage Equality Act. |
Yes
80–90%
70–80%
60–70%
50–60% 
Yes
