The OKC system encompasses all of the City of Oklahoma City radio communications. "Oklahoma City Metro Public Safety" is the correct title.
This includes the shuttle busses at the airport, sewer and waterline maintanance and the concession stands at the Paycom center.
The talkgroups are all on the Radio Reference DB, along with the outlying towns that share the system. Warr Acres, Bethany, Nichols Hills, The Village and Mustang are the ones I can remember off the top of my head.
If you need anything further, pleas let me know.