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|Utah County Organization|
|County Name||County Seat||Year Founded|
|Box Elder||Brigham City||1856|
|Salt Lake||Salt Lake City||1852|
Carson County, Utah Territory created 1854 from parts of Weber, Desert, Tooele, Juab, Millard, Iron counties. In 1861 Nevada Territory took jurisdiction and Carson County was extinguished. Nevada erected Carson City (Independent City), Douglas, Lake, Lyon, Ormsby, Roop, Storey, Washoe, and parts of Churchill, Esmeralda, Humboldt, Mineral, Nye, and Pershing counties from her land.
Cedar County, Utah Territory created 1856 from part of Utah County. Discontinuted 1862; her land parted into Tooele County and Utah County.
Desert County, Utah Territory created 1852 extending from Salt Lake to California. Reduced in 1856, extinguished 1862; her land parted into Box Elder and Tooele counties.
Greasewood County, Utah Territory created 1856 from part of Weber County. Discontinued 1862 and her land given to Box Elder County.
Great Salt Lake County, Utah Territory created 1850; expanded 1852 to Colorado border; reduced 1856; in 1866 reduced again to her present borders and name changed to Salt Lake County.
Green River County, Utah Territory created 1852 included big parts of present-day Colorado and Wyoming. Summit County carved out 1854; in 1856 Malad, Box Elder, and Cache counties peeled off, but Green River County expanded into Salt Lake, Utah, and Sanpete counites; 1861 parts of Colorado and Wyoming shaved off; 1862 Morgan and Wasatch counties trimmed off; 1864 Rich County sliced out; 1868 last part of Wyoming cut out; 1872 Green River County was dissolved, and her land ceded to Summit County.
Humboldt County, Utah Territory formed 1856 from Weber, Desert, Tooele, and Juab counties. Nevada took jurisdiction in 1861 forming her own Humboldt County, Nevada to the northeast. On the former Humboldt County's land, Nevada formed parts of her own Humboldt, Churchill, Elko, Eureka, Lander, and Pershing counties.
Little Salt Lake County, Utah Territory created 1850 with undefined boundaries on unsettled land. In 1852 the legislature redefined the area as Iron County.
Malad County, Utah Territory created 1856 from part of Weber County. Discontinued 1862, her land ceded to Box Elder County.
Richland County, Utah Territory formed 1864 from parts of Cache, Summit, and Green River counties. In 1868 part was given to Wyoming and the rest renamed Rich County.
Rio Virgin County, Utah Territory created 1869 from Washington County. Discontinued 1872 after a survey showed most of it was in Nevada and Arizona Territory.
Saint Mary's County, Utah Territory formed 1856 from parts of Weber, Desert, Tooele, and Juab counties. In 1861 Nevada Territory took jurisdiction and Saint Mary's ended. On Saint Mary's land, Nevada created parts of Elko, Eureka, and White Pine counties.
Shambip County, Utah Territory created 1856 from part of Tooele County. Discontinued 1862 and her land reverted to Tooele County.
Submitted and transcribed by Sandra Davis