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Ac6v's Guide to Ham Radio Frequencies 
Lists general and ham radio frequencies ranging from scanners to the space shuttle.

NOAA Weather Radio All Hazards 
Find weather frequencies for the United States and its possessions.

Radio Reference Database 
Search for airport, government, law enforcement, fire and EMS, and hospital frequencies for Ohio and other states at this comprehensive site. World frequencies may also be searched.

Radio Shack Shortwave Radio Stations List 
This is the frequency list of the more commonly-heard world radio stations.

Scanner Frequencies 
Search for frequencies by state and city.

ScanOhio.com 
Provides scanner frequencies and codes at the county and state level as well as specialty frequencies.

WPAScanner
Provides scanner frequencies for the Commonwealth of Pennsylvania, the city of Pittsburgh, and a few Pennsylvania counties.