Presently at my desk I have one scanner for law enforcement, and another for fire/ems.
The police one I have the OKWIN P25 system for highway patrol, surrounding county sheriffs (Oklahoma, Logan, Canadian, Lincoln, Pottawatomie, McClain, Cleveland, Grady), some local cities that are on that system (Edmond, Midwest City, Moore, Del City, El Reno, Guthrie, Nichols Hills/Village), and state and local emergency management and mutual aid. Add the OKC P25II system for OKC police and the towns that are on their system (might even want a separate scanner for that system), and the OMACS system and any law enforcement on it. For OKWIN, have only the OKC and Guthrie sites scanned.
Be aware that simulcast distortion can cause problems with OKWIN and the OKC system
The other scanner is for fire/EMS. Same systems as the other one, just have those service types scanned.