Ventura County Sherriff's department in California uses a Bell 205 (UH-1D, UH-1H) for law enforcement, SAR and firefighting. Prior to this aircraft they had a military surplus UH-1B or UH-1C. It had a similar yellow and blue paint scheme to their current helicopter.
The California Department of Forestry had some UH-1B or C helicopters at one time.
You won't find many in service in the US anymore. There were some crashes and the lack of maintenance records from the military resulted in military surplus 204 based (UH-1B, C, E, F) helicopters being made restricted (crew only) by the FAA severly limiting their usefulness for fire and law enforcement.