Go to the “FM Radio Database Query” page in the FCC website. The FCC is, in part, responsible for licensing and regulating all of the broadcast stations in the United States. Any available FM radio slot will be listed in their records.
Select the state you’d like to find a vacant slot in. Under “Record Types” choose “Vacant Allotments.” Search for FM stations in “All Frequencies/Channels.” Then “Submit Data.” Leave all the other fields in the search form, such as “city” and “call sign,” open. With this type of search, it’s better to cast a wide net than it is to try to narrow the field from the onset. Start wide and see what is out there. Then you can narrow your focus.
Check out the competition for the open FM frequencies you may be interested in by selecting “Pending Applications” under “Record Types.” Then highlight your frequency of interest in the “search for FM stations” field.