Primary-Residence-Only Rule
No. Osceola County cannot require a short-term rental to be the owner's primary residence. Florida's FS 509.032(7)(b) bars counties from prohibiting vacation rentals or restricting their duration/frequency, so non-owner-occupied and investor-owned rentals are allowed if licensed.
Does Osceola County require a primary residence?
Some RestrictionsFS 509.242(1)(c)
A vacation rental is any unit or group of units in a condominium or cooperative or any individually or collectively owned single-family, two-family, three-family, or four-family house or dwelling unit that is also a transient public lodging establishment but that is not a timeshare project.