RadioReference.com is the world's largest radio communications data provider, featuring a complete frequency database, trunked radio system information, and FCC license data. RadioReference is also the largest broadcaster of public safety live audio communications feeds, hosting thousands of live audio broadcasts of Police, Fire, EMS, and other associated communications.
the alpha and the omega of scanner websites
This this is web site, because it has a lot of very interesting info on scanners and other products.
One of the most consistently updated sites, especially if you own a digital scanner. A must have bookmark!
I would estimate the about 98% of the frequencies and talkgroups for my scanner are from this website.