You can add to that Ohio, Alabama, North Carolina, Kansas, Wyoming, Missouri, Virginia, Pennsylvania, New Jersey and Utah. They all played at one time, I haven't dug far enough to see if they still do, or the last time they did or at what level.
Wyoming - Wyoming/Nebraska 6 Man shoot out 30 Jun 2012.
http://trib.com/sports/high-school/...cle_2f0ef376-3e32-11e1-8e94-0019bb2963f4.html
Ohio - Windham High School and Greenville
North Carolina - Cleveland High School in Shelby, North Carolina, "Bobby Bell, Kansas City Chiefs"
Missouri - Union Star R2, 1960s
Alabama (Lauderdale County) played a short run in the 40s due to WWII.
Colorado - Idalia - references also made to Kansas, Nebraska, Wyoming, Utah. I haven’t found anything on Utah and Kansas yet other than their mention with Idalia Colorado.
Virginia -
For the Marines, in 1953 Hayden Fry (Odessa HS and then Baylor) coached a six man football team (does not make reference to HS or adults) at Quantico while on active duty. Later becoming friends with Al Davis (One time Raiders owner) who was a rival coach in those days.
New Jersey and Pennsylvania - Great Eastern Football Association (Adult 6 man football League) which has teams from both states.
Running total: Texas, New Mexico, Montana, Colorado, Nebraska, Florida, Louisiana, Maryland, South Dakota, Louisiana, Alabama, Arkansas, California, North Carolina, Kansas, Missouri, Ohio, Utah, Virginia, New Jersey and Wyoming.