Park Valley is an unincorporated community in Box Elder County.

While the Transcontinental Railroad coming to Utah did not pass directly through the valley, its proximity played an important part in the settlement and development of the area. Settlement was apparently a result of surveys conducted for several miles on either side of the railroad right-of-way. Even before the rails were joined at Promontory on May 10, 1869, the effect of the railroad on Park Valley had begun. The first permanent settler was William P. (Cotton) Thomas, who migrated from Brigham City in 1869, and developed a cattle ranch near Dove Creek. The heavy growth of trees along the creek and the view of the valley inspired the name.

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