Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Hawaii, Illinois, Indiana, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Nebraska, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Texas, Virginia, Washington, West Virginia. That's 27, off the top of my head, with Wisconsin to come this weekend, along with Kansas, Minnesota, and Iowa in the years ahead. So I'm missing three of the first 30 - possibly games in New Hampshire (Dartmouth?), Rhode Island (Brown?), Maine, or Vermont from back in the days when we played a very small time schedule?
I'm assuming that any games we might have played in DC wouldn't count as a "state." I'm also assuming that you're only talking about football. Basketball would add many more, if not most of the rest.