Quick searches for USA FM / AM / TV / LPFM / TIS Stations from the FCC:
[
www.fcc.gov] FM Query
[
www.fcc.gov] AM Query
[
www.fcc.gov] TV Query
[
www.fcc.gov] LPFM Search
[
www.fcc.gov] TIS Search
Then, this commercial site is also very useful: [
radio-locator.com]
There. Bookmark these, and thar' ya is.