The Sentinel was founded in 1871 by David A. Gordon and C. L. Minor when Yuma was still known as Arizona City.

The Sun was founded by Mulford Winsor, the son of a newspaper editor.

[5] In the midst of the Great Depression, it was soon realized that Yuma, a city of only 5,000, could not support two daily newspapers.

The owners reasoned that the main sources of national and world news — Washington, D.C., and New York — were two hours to three hours ahead of Yuma and so an afternoon newspaper would be able to carry the latest news of the outside world.

[5] In 2001, the newspaper went back to its roots, changing its name to The Sun and returning to morning delivery seven days a week.

It became the Yuma Sun, reflecting its growing role as not only a printed newspaper but also as a digital source of information on the Internet.