Changes

As of August 2011, there are 41 states that ban [[same-sex marriage]], mostly by Constitution.

As of May 2015, there are 34 states that ban [[same-sex marriage]], most by constitutional provision or amendment. Twenty-seven of these bans have been ruled unconstitutional by state or federal courts. As a result of these rulings, same-sex marriages are effectively legal in 19 of these states (AK, AZ, CA, CO, FL, ID, IN, MT, NV, NC, OK, OR, PA, SC, UT, VA, WV, WI, and WY).

The 16 states, plus Washington, D.C., which do not ban same-sex marriage are:

The 16 states, plus Washington, D.C., which do not ban same-sex marriage are: