I used to write down the addresses or roads down, then travel over to
Google Maps. Then type in the road or address like this (555 Radio Rd, TN) and it will show all the roads in TN with that name on the left. When I get done it has narrowed it down to one place. The next question is whether it is a county or city police. If all the addresses were in a city area then it more than likely the city or if the roads were strung out across the county then it is the county sheriff. Works like a charm when you have that info.
If they use the 10 codes and signal codes then it is law enforcement of some sorts. I cant pick up Greentop Mtn from here.