Nope. Only you, listening and hearing them name the channel / Zone and/or Site name will
actually know/determine the location - and with many of the Zones being Wide Area
you may only be listening to One of 5+ sites and hear them say "Reading" but you are on the Pittsburgh freq as a hobbyist
Radio programming / templates for this agency are UNIQUE to each Field Office
The FBI has 55 field offices (also called divisions) centrally located in major metropolitan areas across the U.S. and Puerto Rico. They are the places where we carry out investigations, assess local and regional crime threats, and work closely with partners on cases and operations.
www.fbi.gov
and if an Agent from Maine needs to take his radio to Orlando the only common channels will/would be the D Zone
wiki.radioreference.com
or borrow a radio from the local FO or RA
That said a typical FO channel is broken down to
A - Admin - usually in/around the Field Office City/Town
then B/C would be the RA's
D - Nationwide Common
E/F/G etc for each of the RA's of combination of RA's to cover the entire FO Region
Example - and by no means indicating this is how Boston is done
Boston Field Office, is comprise of RA's in
Lakeville MA
Lowell MA
Springfield MA
Worcester MA
Augusta ME
Bangor ME
Portland ME
Bedford NH
Hampton NH
Providence RI
Radio Zones
A - Admin - Metro Boston Area
B - Lowell RA / Worcester RA
C - Lakeville RA
D - Nationwide
E/F - Bedford RA / Hampton RA / Portland RA
G - Augusta RA / Bangor RA
H - Providence RA
I/J/K/L - etc created as needed and could be An Adj FO's channels for the neighboring states
I'm listening from home in PA; I just "ass umed" they were the same designators in my area; next time I will leave the ch designators OUT.