National Conference of State Legislatures National Conference of State Legislatures Issues Snapshot—Marriage Equality only three states Same-Sex Marriage Laws National Conference of State Legislatures National Conference of State Legislatures website Same-Sex Marriage, Civil Unions and Domestic Partnerships http://www.ncsl.org... started in 1993 http://www.ncsl.org... 37 (out of 50) states and the District of Columbia 37 (out of 50) states and the District of Columbia Same Sex Marriage Laws National Conference of State Legislatures U.S. Supreme Court Same-Sex Marriage Laws upheld a ban last year on same-sex marriages Same-Sex Marriage Laws National Conference of State Legislatures upheld a ban last year on same-sex marriages 35 states Maryland Maryland A dozen states Same Sex Marriage Laws Same Sex Marriage Laws five states National Conference of State Legislatures website Same-Sex Marriage Laws www.ncsl.org 31 states View Source