This is all that is known: Businesses Scanner Frequencies York County
Many businesses are on trunked radio systems, nextel, and other radio systems that "rent out" frequencies to users. What this means is the individual user does not have a license registered in their name, which makes identification very difficult. Add that to the fact that most scanner enthusiasts are more interested in identifying public safety users, and you have a significant lack of information about business users.
You can try to search the FCC database. If you are interested, we can point you in the right direction for this. You can also try using your scanner's close call or signal stalker when you are near any business of interest.