|Counties of Utah|
|Location||State of Utah|
|Populations||976 (Daggett) – 1,186,421 (Salt Lake)|
|Areas||299 square miles (770 km2) (Davis) – 7,820 square miles (20,300 km2) (San Juan)|
There are 29 counties in the U.S. state of Utah. There were originally seven counties established under the provisional State of Deseret in 1849: Davis, Iron, Sanpete, Salt Lake, Tooele, Utah, and Weber.  The Territory of Utah was created in 1851 with the first territorial legislature meeting from 1851–1852. The first legislature re-created the original counties from the State of Deseret under territorial law as well as establishing three additional counties: Juab, Millard, and Washington. All other counties were established between 1854 and 1894 by the Utah Territorial Legislature under territorial law except for the last two counties formed, Daggett and Duchesne. They were created by popular vote and by gubernatorial proclamation after Utah became a state.  Present-day Duchesne County encompassed an Indian reservation that was created in 1861. The reservation was opened to homesteaders in 1905 and the county was created in 1913.  Due to dangerous roads, mountainous terrain, and bad weather preventing travel via a direct route, 19th century residents in present-day Daggett County had to travel 400 to 800 miles (640 to 1,290 km) on both stage and rail to conduct business in Vernal, the county seat for Uintah County a mere 50 miles (80 km) away. In 1917, all Uintah County residents voted to create Daggett County. 
Based on 2021 United States Census data, the population of Utah was 3,337,975. Just over 75% of Utah's population is concentrated along four Wasatch Front counties: Salt Lake, Utah, Davis, and Weber. Salt Lake County was the largest county in the state with a population of 1,186,421, followed by Utah County with 684,986, Davis County with 367,285 and Weber County with 267,066. Daggett County was the least populated with 976 people. The largest county in land area is San Juan County with 7,821 square miles (20,260 km2) and Davis County is the smallest with 304 square miles (790 km2). 
The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify states and counties, is provided with each county.  Utah's FIPS code is 49, which when combined with any county code would be written as 49XXX. In the FIPS code column in the table below, each FIPS code links to the most current census data for that county. 
The Utah Code (Title 17, Chapter 50, Part 5) divides the counties into six classes by population: 
The county classes, for example, are used in the Utah legislature in crafting of legislation to distinguish between more urban and rural areas, such as important yet subtle distinctions in how revenue can be distributed. Usually, a bill intended to benefit rural counties would target the counties of the fourth, fifth and sixth class. 
Under Utah Code (Title 17, Chapter 52a, Part 2), Utah counties are permitted to choose one of four forms of county government:  a three-member full-time commission; a five or seven member expanded commission; a three to nine member (odd-numbered) part-time council with a full-time elected county mayor or a three to nine member (odd-numbered) part-time council with a full-time manager appointed by the council. 23 out of 29 counties are ruled by the standard three-member commission. Of the other six, Cache County was the first change in 1988 to a seven-member council with an elected mayor. Grand County adopted a seven-member council with appointed manager in 1992, followed by Morgan County in 1999 and Wasatch County in 2003. In 1998, Salt Lake County residents approved adopting a nine-member council with elected mayor that began work in 2001.  Summit County adopted a five-member council with an appointed manager in 2006. 
|County||FIPS code ||County seat  ||Est.  ||Origin ||Etymology ||Population ||Area ||Map|
|BeaverCounty||001||Beaver||January 5, 1856||Part of Iron County ||The many beavers in the area ||7,249||2,590 sq mi|
|Box ElderCounty||003||Brigham City||January 5, 1856||Part of Weber County||The many Box Elder trees in the area ||59,688||5,746 sq mi|
|CacheCounty||005||Logan||January 5, 1857||Part of Weber County ||Caches of furs made by Rocky Mountain Fur Company trappers ||137,417||1,165 sq mi|
|CarbonCounty||007||Price||March 8, 1894||Part of Emery County||The vast coal beds in the county ||20,372||1,478 sq mi|
|DaggettCounty||009||Manila||January 7, 1918||Part of Summit and Uintah counties||Ellsworth Daggett (1810–1880), the first Utah Surveyor General ||976||697 sq mi|
|DavisCounty||011||Farmington||October 5, 1850||Part of Deseret Great Salt Lake and Weber counties||Daniel C. Davis (1804–1850), Mormon Battalion captain ||367,285||299 sq mi|
|DuchesneCounty||013||Duchesne||January 4, 1915||Part of Wasatch County||Uncertain; likely origins are a Ute word translated "dark canyon", the French and Indian War site of Fort Duquesne (the county's initial settlement was also a fortress), the corrupted name of an area Indian chief, the name of Society of the Sacred Heart founder Rose Philippine Duchesne, the name of French geographer André Duchesne, or the name of French fur trapper and explorer Du Chasne ||19,790||3,241 sq mi|
|EmeryCounty||015||Castle Dale||February 12, 1880||Part of Sanpete County ||George W. Emery (1830–1909), Governor of the Utah Territory from 1875–1880 ||9,967||4,462 sq mi|
|GarfieldCounty||017||Panguitch||March 9, 1882||Part of Iron County||James A. Garfield (1831–1881), President of the United States in 1881 ||5,129||5,083 sq mi|
|GrandCounty||019||Moab||March 13, 1890||Part of Emery County||The Grand River, since renamed to the Colorado River ||9,663||3,672 sq mi|
|IronCounty||021||Parowan||January 31, 1850||Original county of State of Deseret||Iron mines west of Cedar City ||60,519||3,297 sq mi|
|JuabCounty||023||Nephi||March 3, 1852||Original county of Territory of Utah||A Native American word translated "thirsty valley" or "flat plain" ||12,155||3,392 sq mi|
|KaneCounty||025||Kanab||January 16, 1864||Part of Washington County||Thomas L. Kane (1822–1883), U.S. Army officer who spoke in favor of the Mormon migration and settlement of Utah ||7,992||3,990 sq mi|
|MillardCounty||027||Fillmore||October 4, 1851||Original county of Territory of Utah||Millard Fillmore (1800–1874), President of the United States from 1850 to 1853 ||13,164||6,572 sq mi|
|MorganCounty||029||Morgan||January 17, 1862||Part of Davis, Great Salt Lake, Summit, and Weber counties ||Jedediah Morgan Grant (1816–1856), an Apostle of the Church of Jesus Christ of Latter-day Saints ||12,657||609 sq mi|
|PiuteCounty||031||Junction||January 16, 1865||Part of Beaver County||The Piute tribe of Native Americans who lived in the area ||1,487||758 sq mi|
|RichCounty||033||Randolph||January 16, 1864||Part of Cache County||Charles C. Rich (1809–1883), an Apostle of The Church of Jesus Christ of Latter-day Saints ||2,597||1,029 sq mi|
|Salt LakeCounty||035||Salt Lake City||January 31, 1850||Original county of State of Deseret||The Great Salt Lake, the largest terminal lake in the Western Hemisphere ||1,186,421||742 sq mi|
|San JuanCounty||037||Monticello||February 17, 1880||Parts of Kane, Iron, and Piute counties||Named for the San Juan River, a 400-mile (640 km) tributary of the Colorado river located in southern Colorado and Utah ||14,489||7,820 sq mi|
|SanpeteCounty||039||Manti||January 31, 1850||Original county of State of Deseret||Uncertain, possibly from a Ute Chief named San Pitch ||29,106||1,590 sq mi|
|SevierCounty||041||Richfield||January 16, 1865||Part of Sanpete County||The Sevier River, a 280-mile (450 km) river in central Utah ||21,906||1,911 sq mi|
|SummitCounty||043||Coalville||January 13, 1854||Part of Great Salt Lake and Green River counties ||High elevations in the county, which includes 39 of Utah's highest peaks ||43,093||1,872 sq mi|
|TooeleCounty||045||Tooele||January 31, 1850||Original county of State of Deseret||Uncertain, either from the Goshute Tribe Chief Tuilla or the Tules plant that grew in the marshes ||76,640||6,941 sq mi|
|UintahCounty||047||Vernal||February 18, 1880||Part of Sanpete, Summit, and Wasatch counties ||The Uintah band of the Ute tribe who lived in the area ||36,204||4,480 sq mi|
|UtahCounty||049||Provo||January 31, 1850||Original county of State of Deseret||Yuta, the Spanish name for the Ute tribe ||684,986||2,003 sq mi|
|WasatchCounty||051||Heber City||January 17, 1862||Part of Great Salt Lake, Green River, Sanpete, Summit, and Utah counties ||A Native American word meaning "mountain pass", also the name of the Wasatch Range ||36,173||1,176 sq mi|
|WashingtonCounty||053||St. George||March 3, 1852||Original county of Territory of Utah||George Washington (1732–1799), President of the United States from 1789 to 1797 ||191,226||2,426 sq mi|
|WayneCounty||055||Loa||March 10, 1892||Part of Piute County||Wayne County, Tennessee ||2,558||2,461 sq mi|
|WeberCounty||057||Ogden||January 31, 1850||Original county of State of Deseret||The Weber River, a 125 miles (201 km) tributary of the Great Salt Lake ||267,066||576 sq mi|
There were ten counties in the Territory of Utah that were absorbed by other states or other Utah counties.
|County ||Established ||Superseded ||Etymology||Present location |
|Carson County||January 17, 1854||March 2, 1861||Named for Kit Carson, an American frontiersman ||Nevada|
|Cedar County||January 5, 1856||January 17, 1862||Named for the numerous cedar trees growing in the area (which are actually juniper trees)  ||Utah County|
|Desert County||March 3, 1852||January 17, 1862||Named for the surrounding desert||Box Elder County, Tooele County and Nevada|
|Greasewood County||January 5, 1856||January 17, 1862||Named for the greasewood plant growing in the area ||Box Elder County|
|Green River County||March 3, 1852||February 16, 1872||Named for the Green River, a 730-mile (1,170 km) tributary of the Colorado River that runs through Wyoming, Colorado and Utah ||Cache, Weber, Morgan, Davis, Wasatch, Summit, Duchesne, Carbon, and Utah Counties, and Wyoming and Colorado|
|Humboldt County||January 5, 1856||March 2, 1861||Named for the Humboldt River, a 300-mile (480 km) river in Nevada and longest river in the Great Basin ||Nevada|
|Malad County||January 5, 1856||January 17, 1862||Named for the Malad River, the name being French for "sickly" ||Box Elder County|
|Rio Virgen County||February 18, 1869||February 16, 1872||Named for the Virgin River (el Rio de la Virgen  ), a 160-mile-long (260 km) tributary of the Colorado River located in southern Utah and Nevada ||Washington County, Nevada and Arizona|
|St. Mary's County||January 5, 1856||January 17, 1862||Named after the Mary's River, which was later renamed to the Humboldt River ||Nevada|
|Shambip County||January 12, 1856||January 17, 1862||Goshute Native American Tribe word for Rush Lake ||Tooele County|
Daggett County is a county in the northeastern corner of the U.S. state of Utah. As of the 2020 United States Census, the population was 935, making it the least populous county in Utah. Its county seat is Manila. The county was named for Ellsworth Daggett, the first surveyor-general of Utah. The small community of Dutch John, located near the state line with Colorado and Wyoming, became an incorporated town in January 2016.
Beaver County is a county in west central Utah, United States. As of the 2020 United States Census, the population was 7,072, up from the 2010 figure of 6,629. Its county seat and largest city is Beaver. The county was named for the abundance of beaver in the area.
Duchesne County is a county in the northeast part of the U.S. state of Utah. As of the 2010 United States Census, the population was 18,607. Its county seat is Duchesne, and the largest city is Roosevelt.
Summit County is a county in the U.S. state of Utah, occupying a rugged and mountainous area. As of the 2010 United States Census, the population was 36,324. Its county seat is Coalville, and the largest city is Park City.
Uintah County is a county in the U.S. state of Utah. As of the 2020 United States Census the population was 35,620. Its county seat and largest city is Vernal. The county was named for the portion of the Ute Indian tribe that lived in the basin.
Duchesne is a city in and the county seat of Duchesne County, Utah, United States. The population was 1,588 at the 2020 census.
The Uintah and Ouray Indian Reservation is located in northeastern Utah, United States. It is the homeland of the Ute Indian Tribe, and is the largest of three Indian reservations inhabited by members of the Ute Tribe of Native Americans.
Talmage is an unincorporated community in central Duchesne County, Utah, United States.
Altonah is an unincorporated community in central Duchesne County, Utah, United States.
Fruitland is an unincorporated community in western Duchesne County, Utah, United States, on the Uintah and Ouray Indian Reservation.
Hanna is an unincorporated community in western Duchesne County, Utah, United States, on the Uintah and Ouray Indian Reservation.
Lapoint is an unincorporated community in western Uintah County, Utah, United States.
Mountain Home is an unincorporated community in central Duchesne County, Utah, United States, adjacent to the Uintah and Ouray Indian Reservation.
Strawberry is an unincorporated community in western Duchesne County, Utah, United States. Most of the inhabitants live along the Strawberry River between the Strawberry River pinnacles and Starvation Reservoir west of the city of Duchesne, the county seat of Duchesne County.
The Duchesne River, located in the Uintah Basin region of Utah in the western United States, is a tributary of the Green River. The watershed of the river covers the Northeastern corner of Utah. The Duchesne River is 115 miles (185 km) long, and drains a total land area of 3,790 square miles (9,800 km2).
Ouray is an unincorporated village of the Uintah and Ouray Indian Reservation, located in west‑central Uintah County, Utah, United States.
The first African Americans to arrive in Utah were fur trappers in the early 19th century. The second influx consisted of both freedmen who were converts to the Church of Jesus Christ of Latter-day Saints and slaves belonging to white converts. Later, most African American immigrants to Utah would migrate out for labor-related motivations. African Americans have traditionally been composed only a small part of the total population in Utah, with the 2010 census placing the percentage of African Americans at 1.06%. Utah ranks 40th in the United States for total African American population and 43rd in percentage of residents who are African American.
Ioka is an unincorporated community in eastern Duchesne County, Utah, United States.
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