Since 2006, Florida has utilized a statewide computerized voter registration list called the Florida Voter Registration System (FVRS). Instead of registering to vote at just the county level, voters now register at the state level and are issued a unique state voter ID number. This has also made moving your registration from one county in Florida to another as simple as updating your address, rather than having to re-register to vote. Moving between counties in Florida is considered an address change, not subject to the 29 day book closing deadline, which applies to persons registering for the first time in Florida.
If you would like to check to see if you are registered anywhere in the state of Florida, you can use the search page Florida Statewide Voter Look-up