Here are links to some of the local Supervisor of Elections websites. Make sure you are registered to vote at your current home address. If you're not registered yet, make sure to do it soon...the registration deadline for voting in the primary is coming up very soon!
Also, because Florida is a "closed primary" state, you cannot vote in the August 24th primary unless you are registered with a party. In other words, if you are currently registered independent, libertarian, no party affiliation, or with any other third party, and you want to participate in helping us select our Republican Congressional nominees, you'll need to contact your Supervisor of Elections and request the form to change your party registration.
Can't find your county?
The Florida Divisions of Elections has a list of all Supervisor of Elections offices around the state available here.