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| NOTES:
Rich county was known as Richland until 29 Jan 1868.
Salt Lake County was known as Great Salt Lake County until 29 Jan 1868.
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| Extinct Utah Counties |
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County
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Date Formed
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Date Dissolved
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Present Location
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| Carson |
17 Jan 1854 |
14 Jan 1857 |
Nevada |
| 17 Jan 1859 |
02 Mar 1861 |
Cedar
|
05 Jan 1856 |
17 Jan 1862 |
Utah County |
Desert
|
03 Mar 1852 |
17 Jan 1862 |
Box Elder and Tooele Counties and Nevada |
Greasewood
|
05 Jan 1856 |
17 Jan 1862 |
Box Elder County |
Great Salt Lake
|
03 Mar 1852 |
renamed |
Great Salt Lake County until 29 Jan 1868, renamed Salt Lake County. |
| Green River |
03 Mar 1852 |
22 Dec 1857 |
Cache, Weber, Morgan, Davis, Wasatch, Summit, Duchesne, Carbon, and Utah Counties, and Wyoming and Colorado
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| 17 Jan 1859 |
16 Feb 1872 |
| Humboldt |
05 Jan 1856 |
02 Mar 1861 |
Nevada
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| Malad |
05 Jan 1856 |
17 Jan 1862 |
Box Elder County
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| Richland |
16 Jan 1864 |
renamed |
Richland County until 29 Jan 1868, renamed Rich County
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| Rio Virgin |
18 Feb 1869 |
16 Feb 1872 |
Washington County, Nevada, and Arizona
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| St. Mary's |
05 Jan 1856 |
02 Mar 1861 |
Nevada
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| Shambip |
12 Jan 1856 |
17 Jan 1862 |
Tooele County |
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