KIIS-Los Angeles, Z100-New York, BBC Radio 1, Star 94-Atlanta and XM Top 20 on 20 are all popular radio stations. Although these stations broadcast to a limited regional market on FM/AM wavelengths, most of them are also accessible online via individual official station websites.
Nielson measures radio station popularity for both commercial and public radio. It reports data by regional market and by time of day, rather than compiling it on a national or international level. Popular stations are more likely to be broadcast from regional markets with larger populations since popularity measurements count the number of audience numbers, and a larger potential audience population gives a statistical advantage against smaller markets.
New York and Los Angeles are the two largest regional markets within the United States, both enjoying populations of over 10 million, and each city is home to one of the most popular stations in the country. Most popular stations feature programming focusing on top 40 hits, airing segments with uninterrupted blocks of music or music segments that mix in commentary from radio DJ personalities hosting on a regular schedule. KIIS in Los Angeles is one example of a success story following this formula, having achieved success partially due to the popularity of its on-air DJ personality, Ryan Seacrest.