On November 5, 2013, the Illinois legislature voted to legalize same-sex marriage in Illinois and Gov. Pat Quinn signed the bill into law on November 20, 2013. The bill had previously passed the Illinois Senate on February 14, 2013, but at the end of the spring session in May, State Rep. http://www.illinoisdivorcelaw.org/what-you-need-to-know-about-illinois-same-sex-marriage-law/