Probably not. In most areas departments are dispatched on the county channel and use one of the countywide fireground channels for their operations.
Muskingum County Here
Maybe - but not everywhere. One local twp. has their own MARCS TG, uses the county's VHF for dispatch, but also uses the county's MARCS TG for comms. They seem to mark with the county on either depending on ???
A few of the townships use the county MARCS - but have do not have their own TG.
County has a MARCS and a Fireground MARCS as well.
I do not normally monitor Perry, but when I do I see them using MARCS as well (also see traffic on Unitrunker).
I think the main take away is - it's all changing.