Rockstar's GTA states have always been organised into counties - GTA V split San Andreas into Los Santos County and Blaine County. Leonida almost certainly has a similar structure but Rockstar has not published it.
This piece is explicit speculation - we infer a county structure from the visible regions and we say so plainly. For confirmed material, stay on the Leonida hub.
Why a county structure probably exists
Two reasons. First, Rockstar's pattern - GTA V used counties for a navigation, narrative and aesthetic reason. Second, real Florida is heavily county-organised and GTA 6 borrows from real Florida. Likely the game ships at least two named counties.
Whether counties show up as text labels on the in-game map (the GTA V pattern) or as background flavour only is unconfirmed.
A working county breakdown
One county containing Vice City and its immediate suburbs (analogous to Miami-Dade). One county containing the wetlands and small inland towns (analogous to Collier or a combined Everglades-county). One county containing the Keys (analogous to Monroe). Possibly a fourth county for the more northern inland areas.
All of this is pure inference. None of it has been published or named by Rockstar. We hedge accordingly.
Why this matters
It probably doesn't, mechanically. Counties in GTA are mostly atmospheric - they affect signage, radio chatter, and police jurisdiction in narrow ways. They're real in the world but not load-bearing for gameplay.
The bigger reason this article exists: a lot of community discussion confidently uses 'Leonida county names' that aren't from any official source. We try to be transparent about which is which.