RANKING · 2025 ESTIMATES · 29 SHOWN OF 29

Largest by population, Utah counties

The most populous Utah counties as of the 2025 population estimates. This list covers the 29 counties in Utah that qualify, ranked against each other statewide. The median across all 29 is 20,856.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Salt Lake County, UTUT1,220,916+36%

02Utah County, UTUT759,859+106%

03Davis County, UTUT381,227+60%

04Weber County, UTUT278,174+42%

05Washington County, UTUT213,670+136%

06Cache County, UTUT145,000+59%

07Tooele County, UTUT87,461+115%

08▲1Iron County, UTUT67,141+99%

09▼1Box Elder County, UTUT65,320+53%

10Summit County, UTUT43,141+45%

11▲1Wasatch County, UTUT38,514+153%

12▼1Uintah County, UTUT38,278+52%

13Sanpete County, UTUT31,453+38%

14Sevier County, UTUT22,827+21%

15▲1Duchesne County, UTUT20,856+45%

16▼1Carbon County, UTUT20,680+1%

17San Juan County, UTUT14,542+1%

18Millard County, UTUT14,057+13%

19▲1Juab County, UTUT13,567+65%

20▼1Morgan County, UTUT13,383+88%

21Emery County, UTUT10,177−6%

22Grand County, UTUT9,790+15%

23Kane County, UTUT8,597+42%

24Beaver County, UTUT7,301+22%

25Garfield County, UTUT5,256+11%

26Rich County, UTUT2,687+37%

27Wayne County, UTUT2,587+3%

28Piute County, UTUT1,509+5%

29Daggett County, UTUT934+1%

SHOWING 1–29 OF 29

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES