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County
 
County seat Established
 
Origin Etymology
 
Population
(2010)
Area
(2010) 
Map
 
 Beaver County Beaver 1856 Part of Iron County The many beavers in the area 6,629 2,590 sq mi State map highlighting Beaver County
 Box Elder County Brigham City 1856 Part of Weber County The many Box Elder trees in the area 49,975 5,746 sq mi State map highlighting Box Elder County
 Cache County Logan 1857 Part of Weber County Caches of furs made by Rocky Mountain Fur Company trappers 112,656 1,165 sq mi State map highlighting Cache County
 Carbon County Price 1894 Part of Emery County The vast coal beds in the county. 21,403 1,478 sq mi State map highlighting Carbon County
 Daggett County Manila 1919 Part of Uintah County Ellsworth Daggett (18101880), the first Utah Surveyor General 1,059 697 sq mi State map highlighting Daggett County
 Davis County Farmington 1850 Originally State of Deseret Daniel C. Davis (18041850), Mormon Battalion Captain 306,479 299 sq mi State map highlighting Davis County
 Duchesne County Duchesne 1913 Part of Wasatch County Origins are likely a Ute word "dark canyon", the French and Indian War site of Fort Duquesne the name of an area Indian chief, or the name of French fur trapper and explorer. 18,607 3,241 sq mi State map highlighting Duchesne County
 Emery County Castle Dale 1880 Part of Sanpete County George W. Emery (18301909), Governor of the Utah Territory from 18751880 10,976 4,462 sq mi State map highlighting Emery County
 Garfield County Panguitch 1882 Part of Iron County James A. Garfield (18311881), President of the United States in 1881 5,172 5,175 sq mi State map highlighting Garfield County
 Grand County Moab 1890 Part of Emery County The Grand River, since renamed to the Colorado River 9,225 3,672 sq mi State map highlighting Grand County
 Iron County Parowan 1850 Original county of State of Deseret Iron mines west of Cedar City. 46,163 3,297 sq mi State map highlighting Iron County
 Juab County Nephi 1852 Original county of Territory of Utah A Native American word translated "thirsty valley" 10,246 3,392 sq mi State map highlighting Juab County
 Kane County Kanab 1864 Part of Washington County Thomas L. Kane (18221883), U.S. Army Officer who spoke in favor of the Mormon migration and settlement of Utah 7,125 3,990 sq mi State map highlighting Kane County
 Millard County Fillmore 1851 Original county of Territory of Utah Millard Fillmore (18001874), President of the United States from 1850 to 1853 12,503 6,572 sq mi State map highlighting Millard County
 Morgan County Morgan 1862 Part of Davis County Jedediah Morgan Grant (18161856), an Apostle of The Church of Jesus Christ of Latter-day Saints 9,469 609 sq mi State map highlighting Morgan County
 Piute County Junction 1865 Part of Beaver County The Piute tribe of Native Americans who lived in the area 1,556 758 sq mi State map highlighting Piute County
 Rich County Randolph 1864 Part of Cache County Charles C. Rich (18091883), an Apostle of The Church of Jesus Christ of Latter-day Saints 2,264 1,029 sq mi State map highlighting Rich County
 Salt Lake County Salt Lake City 1849 Original county of State of Deseret The Great Salt Lake, the largest terminal lake in the Western Hemisphere 1,029,665 742 sq mi State map highlighting Salt Lake County
 San Juan County Monticello 1880 Parts of Kane, Iron, and Piute counties Named for the San Juan River, a 400-mile  tributary of the Colorado river located in Southern Colorado and Utah 14,746 7,820 sq mi State map highlighting San Juan County
 Sanpete County Manti 1849 Original county of State of Deseret Uncertain, possibly from a Ute Chief named San Pitch 27,882 1,590 sq mi State map highlighting Sanpete County
 Sevier County Richfield 1862 Part of Sanpete County The Sevier River, a 280-mile river in central Utah 20,802 1,911 sq mi State map highlighting Sevier County
 Summit County Coalville 1854 Part of Salt Lake and Green River counties High elevations in the county, which includes 39 of Utah's highest peaks 36,324 1,872 sq mi State map highlighting Summit County
 Tooele County Tooele 1849 Original county of State of Deseret Uncertain, either from the Goshute Tribe Chief Tuilla or the Tules plant that grew in the marshes 58,218 6,941 sq mi State map highlighting Tooele County
 Uintah County Vernal 1880 Part of Wasatch The Uintah band of the Ute tribe who lived in the area 32,588 4,480 sq mi State map highlighting Uintah County
 Utah County Provo 1849 Original county of State of Deseret Yuta, the Spanish name for the Ute tribe 516,564 2,003 sq mi State map highlighting Utah County
 Wasatch County Heber City 1862 Part of Utah and Sanpete counties A Native American word meaning "mountain pass", also the name of the Wasatch Range 23,530 1,176 sq mi State map highlighting Wasatch County

 Washington County

St. George

1852

Original county of Territory of Utah

George Washington (17321799), President of the United States from 1789 to 1797

138,115

2,426 sq mi

State map highlighting Washington County

 Wayne County

Loa

1892

Part of Piute County

Wayne Robinson, the son of Utah state legislator Willis Robinson, who was killed by a horse while both men traveled to a legislative session.

2,589

2,461 sq mi

State map highlighting Wayne County

 Weber County

 

Ogden 1849

Original county of 

State of Deseret

 

The Weber River, a 125 miles tributary of the Great Salt Lake

 

231,236 576 sq mi State map highlighting Weber County

 

 

 

 

 

 

 

 

 

 

 

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