Sunnyside's post office was established July 16, 1914 and discontinued March 15, 1934. Sunnyside was a religious town composed of the Donnellites, followers of Samuel Donnelly. All of the miners were religious and the town was devoted to hymn singing, bible reading, and putting in a hard days work. If a miner came to town looking for work, they would put him to work. But, if he slacked off and started not putting in his fair share, the town would ask him to move on. This is the only town known in Arizona to be a 100% religious mining town. The town lived as socialists, pooling all the money into the community. Each person did what their talents enabled them to do for the betterment of the community. The Donellites were very generous and supported whoever they saw had a need. When the mine played out the Donnellites had to disband to the men could find work elsewhere.

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