Georgetown - negative on rebanding.
Charleston - negative on the Palmetto 800 sites or the City of Charleston TRS (someone correct me if I'm wrong on that). Palmetto P25 (the P25 system used by Charleston County) is using rebanded frequencies, but since it's a P25 system, nothing special has to be set in your scanner to receive it.
You didn't specifically ask, but Horry County's TRS has not yet rebanded. Myrtle Beach's system has, but it's not clear what city agencies are using that system - FD and PD are on the Horry County system.
Hope that helps.