When I created this, I wasn't sure it was going to be useful, but I found it to be very interesting because it shows the cluster of states with teams-which I've never seen before. It's also easy to see why other sports are a bigger deal in some parts of the country-those without MLB teams.
Overall, California with all its teams lead the league in total state attendance with over 13M.
As always feel free to draw your own conclusions.
Data from ESPN.com