One thing about attendance, a WDW visitor who spend a resort on site basically counts as 7 visits to the Disney Parks, due to the way the industry counts guests. In fact, it could count for more than 7. For example on day 1, they visit MK. On Day 2, they head to DAK and then DHS. On this day, DAK gets a count, but not DHS (First theme Park visited that day is the only one counted). on Day 3, they head to USF and then check out MK for a bit after leaving Universal. Since the parks can't tell, both Universal and Disney gets a park visit.
Also, the TEA chart is misleading as it only shows the top 25 worldwide.
Page 16 of this pdf file of the full report shows the Top 20 in North America.
http://www.teaconnect.org/images/files/TEA_235_103719_170601.pdf
Now California has 6 parks vs Florida's 8.
Also those not open 365 days are not listed.
The Three LEGOLAND California Parks (One is treated as a Theme Park, one as an Aquarium, and one as a Water Park)
The Nor Cal parks are also missing, California's Great America (Cedar Fair), Six Flags Discovery Kingdom, Gilroy Gardens (Managed by Cedar Fair) and the Santa Cruz Boardwalk.
So California has more major Theme Parks than Florida does.
But the original post talked about the amount and variety of Theme Parks, plus the history and length of time the parks have been around. When I was a kid, Orlando was a swamp with no theme parks at all.
But once again, This wasn't a comparison of any of state, or even Nations like Japan. This just made the point, if you look at Theme Parks overall, in all the varied ways of looking at them, California is the True Theme Park Capital of the World.