The station was, for many years, a leading Top 40 station in Houston. In 1981, when sister station KILT-FM dropped album rock for country, 610 dropped its famed Top 40 format for a simulcast of their FM sister station. The current sports-talk format has been in place since 1995. The station has been the top-rated sports-talk format since its inception, with only a few brief exceptions.
In 2007, a lawsuit was filed by then morning show co-host John Granato against CBS. This ultimately led to Granato leaving 610 and starting a new station: 1560 The Game. Shortly thereafter, his co-host Lance Zierlein joined him.