Well they definitely ain’t the largest blue cities NYC, LA, and Chicago are all much larger and blue.

“Jacksonville leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.”

At least according to best Best Neighborhoods, they did go for Angie Nixon though. Tampa is 53% from the same source.

And according to ConservativeMove.com Jacksonville and it’s suburbs is one of the better spots if you want to move to a more conservative city in Florida https://conservativemove.com/liberal-cities-in-florida/

Jacksonville is one of the country club meccas, and Tampa is where all the conservative old folks go retire. Both those usually indicate a conservative lean but it is much closer than I assumed

Edit: I was also wrong they were the biggest in the country, that title goes to Phoenix, a city that should not exist and is a monument to man’s arrogance