| County | Census Years | Comp | Notes
|
| Beaver (1856) | 1860-1880, 1900-1940 | | Part of Iron county
|
| Box Elder (1856) | 1860-1880, 1900-1940 | | Part of Weber county
|
| Cache (1857) | 1860- | | Part of Weber county
|
| Carbon (1894) | | | Part of Emery county
|
| Carson (1854-1861) | 1860 | | Now part of Nevada
|
| Cedar (1856-1862) | 1860 | | Now Utah county
|
| Daggett (1919) | | | Part of Uintah county
|
| Davis (1850) | 1860- | | Original county of State of Deseret
|
| Desert (1852-1862) | | | Now Box Elder & Tooele counties & part of Nevada
|
| Duchesne (1913) | | | Part of Wasatch county
|
| Emery (1880) | | | Part of Sanpete county
|
| Garfield (1882) | | | Part of Iron county
|
| Grand (1890) | | | Part of Emery county
|
| Greasewood (1856-1862) | | | Now Box Elder county
|
| Green River (1852-1872) | 1860- | | Now Cache, Weber, Morgan, Davis, Wasatch, Summit Duchesne, Carbon & Utah counties, parts of Wyoming and Colorado
|
| Humboldt (1856-1861) | 1860 | | Now Part of Nevada
|
| Iron (1850) | 1860- | | Original county of State of Deseret
|
| Juab (1852) | 1860- | | Original county of Territory of Utah
|
| Kane (1864) | | | Part of Washington county
|
| Malad (1856-1862) | | | Now Box Elder county
|
| Millard (1851) | 1860- | | Original county of Territory of Utah
|
| Morgan (1862) | | | Part of Davis county
|
| Piute (1865) | | | Part of Beaver county
|
| Rich (1864) | | | Part of Cache county
|
| Rio Virgin (1869-1872) | | | Now Washington county, parts of Nevada and Arizona
|
| Salt Lake (1849) | 1860- | | Original county of State of Deseret
|
| San Juan (1880) | | | Parts of Kane, Iron and Piute counties
|
| Sanpete (1849) | 1860- | | Original county of State of Deseret
|
| Sevier (1862) | | | Part of Sanpete county
|
| Shambip (1856-1862) | 1860 | | Now Tooele county
|
| St. Marys (1856-1861) | 1860 | | Now part of Nevada
|
| Summit (1854) | 1860- | | Part of Salt Lake and Green River counties
|
| Tooele (1849) | 1860- | | Original county of State of Deseret
|
| Uintah (1880) | | | Part of Wasatch county
|
| Utah (1849) | 1860- | | Original county of State of Deseret
|
| Wasatch (1862) | | | Part of Utah and Sanpete counties
|
| Washington (1852) | 1860- | | Original county of Territory of Utah
|
| Wayne (1892) | | | Part of Piute county
|
| Weber (1849) | 1850-1880, 1900-1940 | YES | Original county of State of Deseret
|
