Founded in 1894, it has significant circulation in neighboring Riverside County, and serves most of the Inland Empire in Southern California, with a circulation area spanning from the border of Los Angeles and Orange counties to the west, east to Yucaipa, north to the San Bernardino Mountain range and south to the Riverside County line.

It publishes the annual PrepXtra high school football magazine with capsules and schedules for all schools in Pomona and San Bernardino valleys.

It is part of the Southern California News Group family of local newspapers serving specific areas of Southern California.

The Sun is owned by Digital First Media which is controlled by Alden Global Capital.

Gannett purchased it in 1968, and MediaNews Group took control of it in 1999,[5] making it a sister newspaper to the Times' rival, the Los Angeles Daily News.