About ScanAtlas

ScanAtlas lists scanner frequencies for 350 U.S. incorporated places with 100,000 or more residents (Census Bureau city estimates, July 1, 2025). Each city page combines statewide public-safety networks, nearby FAA airfields, nearby military airfields, NOAA Weather Radio, DHS NIFOG interoperability channels, ham calling, railroad AAR, and published conventional city channels.

Sources are public: FCC band plans and licenses, the DHS National Interoperability Field Operations Guide, NOAA NWR channel plan, FAA Chart Supplement-style airfield frequencies, AAR railroad channel numbering, and widely published conventional assignments. This is not RadioReference, not an FCC product, and not a substitute for a radio on the air.

Live audio on NOAA channels comes from volunteer relays at NOAA Weather Radio Org / WxRadio. A handful of public Icecast scanners (including SomaFM) appear when they sit near a city. Trunked public-safety systems are not decoded here. Streams go silent when a feeder drops. Do not rely on internet audio for watches, warnings, or emergency response.

Frequencies move. Agencies encrypt. Control channels rotate. Treat every row as a starting scan list, then verify on the air. Do not rely on this atlas for emergency response.

Monitoring unencrypted radio in the United States is generally lawful. Some states restrict mobile scanners. Encrypted or cellular communications may not be intercepted. Do not use a transmitter on public-safety channels unless you are licensed and authorized.

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