I normally use the IFR Low Altitude Enroute chart for finding a center
frequency... If the local frequency isn't the radar center you want
the controller will hand you off..

denny

john smith wrote:
Each approach facility has a map the each point described by a lat/lon.
These charts have an FAA designation number which I will see if I can
find. I have some from 25 years ago for Dayton, Cincinnati and Columbus
terminal approach facilities. These all underlie ZID/Indianapolis Center.