Anti-marriage constitutional amendment


State activists are working toward fairness for all of Missouri's families by overturning a constitutional amendment that prohibits the freedom to marry for same-sex couples in the state.

In February 2014, the American Civil Liberties Union and PROMO filed a lawsuit, Barrier v. Vasterling, in state court seeking legal respect for same-sex couples who married in other states. Read more about marriage litigation in Missouri.


On August 3, 2004, anti-gay forces in Missouri pushed through Constitutional Amendment 2, an anti-marriage constitutional amendment that excludes same-sex couples from marriage. 


  • PROMO is Missouri's statewide organization advocating for lesbian, gay, bisexual, and transgender equality through legislative action, electoral politics, grassroots organizing, and community education.
  • Freedom to Marry is the campaign to win marriage for same-sex couples nationwide.


A large majority of Missouri residents support some form or legal respect for same-sex couples, with 33% saying they support marriage and 31% saying that gay couples should be allowed to form civil unions. (Public Policy Polling, June 2012) 


According to The Williams Institute's analysis of the 2010 U.S. Census, 10,557 same-sex couples are living in Missouri, representing 4.4 same-sex couples per 1,000 households.


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Resources Related to Missouri

Missouri Census Snapshot

Demographic and economic information about same-sex couples and same-sex couples raising children in Missouri.

Geographic Trends Among Same-Sex Couples in the U.S. Census and the American Community Survey

Groundbreaking research showing a huge increase in same-sex couples identifying themselves as "unmarried partners".

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