What are the largest counties in Utah?

Salt Lake County is the largest county in Utah, with 1,220,916 residents in 2025 (Census PEP). Utah County (759,859) and Davis County (381,227) come next.

Data as of 2025 · updated November 5, 2026

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All 28 ranked Utah counties

Utah counties ranked by population
Rank	County	Residents 2025	Change 2020–25
1	Salt Lake County	1,220,916	+2.9%
2	Utah County	759,859	+14.5%
3	Davis County	381,227	+4.8%
4	Weber County	278,174	+5.8%
5	Washington County	213,670	+17.4%
6	Cache County	145,000	+8.5%
7	Tooele County	87,461	+19.2%
8	Iron County	67,141	+16.4%
9	Box Elder County	65,320	+12.7%
10	Summit County	43,141	+1.6%
11	Wasatch County	38,514	+9.8%
12	Uintah County	38,278	+7.3%
13	Sanpete County	31,453	+10.3%
14	Sevier County	22,827	+5.9%
15	Duchesne County	20,856	+6.3%
16	Carbon County	20,680	+1.0%
17	San Juan County	14,542	+0.1%
18	Millard County	14,057	+7.7%
19	Juab County	13,567	+14.8%
20	Morgan County	13,383	+8.1%
21	Emery County	10,177	+3.4%
22	Grand County	9,790	+1.1%
23	Kane County	8,597	+11.7%
24	Beaver County	7,301	+3.0%
25	Garfield County	5,256	+3.0%
26	Rich County	2,687	+7.4%
27	Wayne County	2,587	+3.3%
28	Piute County	1,509	+4.8%

How this is ranked

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built.

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Questions

What is the largest county in Utah?

Salt Lake County is the largest county in Utah, with 1,220,916 residents in 2025 (Census PEP). Utah County (759,859) and Davis County (381,227) come next.

How is this ranking calculated?

More rankings for Utah

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