Referendum Question 6|
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| Choice | Votes | % |  
| Yes | 1,373,504 | 52.43% |  
| No | 1,246,045 | 47.57% |  
| Valid votes | 2,619,549 | 95.81% |  
| Invalid or blank votes | 114,627 | 4.19% |  
| Total votes | 2,734,176 | 100.00% |  |
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Congressional district results
 
| Yes   90–100%    80–90%    70–80%    60–70%    50–60%  | No   90–100%    80–90%    70–80%    60–70%    50–60%    |  | 
| Source: Maryland State Board of Elections - Official Results | 
Question 6 (colloquially called the Maryland same-sex marriage referendum) is a referendum that appeared on the general election ballot for the U.S. state of Maryland to allow voters to approve or reject the Civil Marriage Protection Act—a bill legalizing same-sex marriage passed by the General Assembly in 2012. The referendum was approved by 52.4% of voters on November 6, 2012, and thereafter went into effect on January 1, 2013.