Check out this link to the main database page for Spartanburg County:
https://www.radioreference.com/apps/db/?ctid=2354
As of today, you should be able to pick up most all public safety agencies. All county fire departments are on VHF Conventional Analog frequencies. County Sheriff, EMS and Highway Patrol are on the Palmetto 800 trunked radio system using analog talkgroups. Spartanburg City PD is on UHF analog conventional.
Very soon, likely within a few weeks, Palmetto 800 will transition to a digital P25 system called Palmetto P25. All talkgroups on that system will change to digital, which your BCT15X will not support. You'll need to upgrade your radio to continue to monitor Spartanbug Co Sheriff, EMS and Highway Patrol.