Radio Reference and Intercept Radio offer online databases of all police scanner frequencies in the United States, their websites state. Radio Reference allows users to search police scanner frequencies by zip code, state, city and incorporated area.
Intercept Radio's service allow users to choose locations on a map by state, then by choosing a county or municipality. On both Intercept Radio and Radio Reference websites, users can access not only police frequencies but other related local frequencies, such as fire departments, local governments and amateur radio operators. Both websites also list national scanner frequencies for the National Weather Service, military agencies, federal agencies and the Coast Guard.