Hopefully this will be published before it's too outdated.
The Washington Post [washingtonpost.com] has a nice state-by-state breakdown of Zika in the continental US. It separates out "travel-related" cases and "local" cases and has links to each state's website with local information regarding the virus.
There are 7,360 confirmed Zika cases in the U.S., according to the Centers for Disease Control and Prevention [as of Aug 3, 2016]. This includes 1,817 cases in the continental U.S. and 5,526 cases in the U.S. territories of Puerto Rico, the U.S. Virgin Islands and American Samoa.
The first local spread of Zika virus through infected mosquitoes in the continential U.S. occurred in Miami, Florida in late July.