Some states allow first cousins to marry.  Some of those states allow it with restrictions and some have none.  A Spanish speaking couple I knew had asked me to help them learn what they needed for a civil ceremony in Denver back in the 1980s.  So I checked into the process for them and found out all this other information about marriage laws in Colorado.  I always found it funny about the cousins getting married and just tucked it away in the back of my mind. Recently I came across this post and thought I would pass it along.  Interesting to say the least. This info is taken from Cousin Marriage License Laws in the U.S. by , the Marriage Expert at

Please Note:

The information in this article was accurate when it was published. State and county marriage license requirements often change. The information listed below is for guidance only and should not be regarded as legal advice.  It is important that you verify all information with your local marriage license office or county clerk before making any wedding or travel plans.

Note: All states allow the marriage of second cousins.