How many states have constitutional amendments banning same-sex marriage?

  1. Alabama (by constitution and statute);
  2. Arizona (by constitution and statute);
  3. Arkansas (by constitution and statute);
  4. Florida (by constitution and statute);
  5. Georgia (by constitution and statute);
  6. Kansas (by constitution and statute);
  7. Kentucky (by constitution and statute);
  8. Louisiana (by constitution and statute);
  9. Michigan (by constitution and statute);
  10. Mississippi (by constitution and statue);
  11. Missouri (by constitution and statute);
  12. Montana (by constitution and statute);
  13. Nebraska (by constitution and statute);
  14. North Dakota (by constitution and statute);
  15. Ohio (by constitution and statute);
  16. South Carolina (by constitution and statute);
  17. Tennessee (by constitution and statute); and,
  18. Texas (by constitution and statute).