Green River County, Utah Genealogy

United States Utah  Green River County

Green River County, Utah Territory was an extinct county created 3 March 1852 in the northeast corner of Utah Territory on land that eventually became parts of Utah, Wyoming, and Colorado. The remnants of Green River County in Utah Territory were finally dissolved on 16 February 1872.

The only residents of this county on the 1856 Utah territorial census and Utah 1860 federal census were listed at Fort Bridger on the Oregon-California-Mormon Trail in present-day Wyoming.

In 1852 the original Green River County was bounded on the north by Utah Territory's northern border at 42º, on the east by Utah Territory's eastern border at the crest of the Rocky Mountains, on the south by Great Salt Lake County, and on the east by Weber and Davis counties.

On 13 January 1854 the Utah Territoral legislature created Summit County from part of Green River County. On 5 January 1856 the legislature carved parts of Malad, Box Elder, and Cache Counties out of part of Green River County.

In 1861 the U.S. Congress began carving pieces off of Utah Territory to give to other territories. Parts of Utah Territory were given to form parts of Colorado, Nebraska (later Wyoming), and all of the original Nevada Territory. Two of these giveaways directly affected Green River County. Utah Territory south of 41º and east of 109º was given to Colorado Territory which included about half of Green River County. The Green River County land north of 41º and east of 110º was given to Nebraska Territory (later Wyoming) leaving Green River County less than a tenth of its previous size.

On 17 January 1862 parts of Morgan and Wasatch counties were formed from part of Green River County.