American radio is huge. There are more than 15,000 licensed AM and FM stations in the United States, more than in any other country. Drive across it and the dial changes every hour or so, from Spanish-language stations in Texas to country in the plains to college stations in every university town. Here is the simple version of how it fits together.
Three kinds of stations
Commercial stations sell advertising, and they make up most of the dial. A handful of companies own a large share of them. The biggest is iHeartMedia, with Cumulus and Audacy among the other major names. This is the result of the Telecommunications Act of 1996, which removed national limits on how many stations one company could own. Within a few years, thousands of stations had changed hands. Many local stations now share programming, presenters, and playlists across markets.
Public and non-commercial stations sit mostly at the low end of the FM dial, below 92 MHz, a range set aside for educational use. NPR does not own stations. It makes programmes such as Morning Edition and All Things Considered and sells them to hundreds of independent member stations. Federal funding through the Corporation for Public Broadcasting was cancelled in 2025, so these stations now depend even more on listener donations, on-air “pledge drives”, and local sponsors. Religious broadcasters also hold a large share of the non-commercial band.
Low-power and community stations. Since 2000, the FCC has licensed tiny low-power FM stations, with a range of only a few miles, for schools, churches, and community groups.
Who is in charge
The Federal Communications Commission (FCC) licenses stations, assigns frequencies, and enforces a short list of content rules. The main ones bar obscenity, and indecency outside late-night hours. Unlike the UK, there is no general requirement to be politically impartial. The old Fairness Doctrine was dropped in 1987, and that change paved the way for the opinion-led talk radio that grew in the 1990s.
Station names give away where they are. Most stations east of the Mississippi have call letters starting with W, such as WABC, and most to the west start with K, such as KFI. There are old exceptions, like KDKA in Pittsburgh.
What is on the dial
US radio is built around tightly defined formats. Among the biggest by audience and station count:
- Country, consistently one of the largest formats nationwide.
- News/talk, strongest on AM and with older listeners.
- Adult contemporary and top 40 (CHR) for mainstream pop.
- Spanish-language formats such as regional Mexican, tropical, and Spanish contemporary, which are growing with the Latino audience.
- Classic rock, classic hits, and urban/hip-hop.
- Sports talk, often carrying local team broadcasts.
Audiences are measured by Nielsen, and a station’s ratings decide what it can charge for adverts. That is why stations switch formats overnight when the numbers slip.
The other ways Americans listen
- HD Radio, the US digital system, adds extra channels alongside a normal FM signal.
- SiriusXM satellite radio is a paid subscription, mostly heard in cars.
- Streaming apps such as iHeartRadio, Audacy, and individual station apps.
One live argument is whether new cars should keep AM. Some carmakers wanted to drop it. Emergency officials pushed back, because AM’s long range makes it a lifeline when power and phone networks fail. We cover that fight in why AM radio is still alive.
A practical way to sample it
Pick one city and listen across its dial for a day: the NPR member station for news, the top country station, a Spanish-language station, and the college station after dark. You will hear more of America in those four than in any national playlist.