Beaver County, Utah: History
Explorers of European descent first visited present-day Beaver County in the 1776 Domínguez-Escalante Expedition. The proposed territory of Deseret (soon changed to Utah Territory) began with the arrival of Mormon pioneers in 1847. After the immediate Great Salt Lake City area was settled, settlers moved into more outlying areas, including the future Beaver County area. The county was created by the Utah territorial legislature from a section of Iron County on January 5, 1856, before the settlement of Beaver town was founded later that year. The county was named for the animal, which was plentiful there. The county boundary as delineated by that act included areas in present-day Colorado and Nevada. The defined boundary was altered on January 16, 1861, by the creation of two counties in present Nevada. The county area was effectively reduced on February 28, 1861, by the US Congress when it created Colorado Territory, taking all of the Beaver County areas east of 109 degrees longitude. The county's boundary was enlarged on January 17, 1861, by the addition of parcels from Millard, Sanpete, and St. Mary's counties. However, its west area was reduced by the creation of the Nevada Territory on July 14, 1862 (this adjustment was altered on May 5, 1866, by the action of the US Congress, effectively ceding all Beaver County area west of 114 degrees longitude to Nevada counties). The county area was also reduced on January 16, 1865, when Piute County was created from Beaver territory.
A quarter of the county's workers are employed by hog processor Smithfield Foods.