Where is same-sex marriage banned?

California:

On May 15, 2008, the California Supreme Court ordered that the state must allow same-sex couples to marry in order to comply with the state constitution. California began permitting same-sex marriage on June 16, 2008. Proposition 8, a public referendum, prohibited new same-sex marriages beginning November 4, 2008. However, that ban was struck down on August 4, 2010 and California was ordered to resume allowing same-sex couples to marry. However, a temporary stay was issued delaying the implementation of that order until the matter is resolved pending appeal in federal court. That process is scheduled to begin on September 6, 2011. In the meantime, same-sex marriages performed between June 16, 2008 and November 4, 2008 are still legal in California, even if they were performed elsewhere.