County facts · Population · October 24, 2026
Utah Population by County, 2025 Census Estimates
Utah population by county: July 2025 Census estimates for all 29 counties, change since 2020, density, and a link to each official parcel map.
Looking for Utah population by county? The Census Bureau estimates that Utah had 3,538,904 residents on July 1, 2025, spread across 29 counties. Salt Lake County is the most populous, with 1,220,916 people (34% of the state), and Daggett County is the least populous, with 934.
The table below lists every county with its 2025 estimate, its April 2020 starting point, the change, people per square mile, and a link to its official parcel viewer.
Utah population at a glance
- Counties: 29
- Statewide, July 1, 2025: 3,538,904 (April 1, 2020 estimates base: 3,271,601; change +267,303, +8.2%)
- Most populous: Salt Lake County (1,220,916); least populous: Daggett County (934)
- Median county: about 20,856 residents (half of the counties are smaller)
- The 5 largest counties hold 81% of all Utah residents
- Counties with 1,000,000+ residents: 1 · 100,000+: 6 · under 10,000: 8
- Statewide density: about 43 people per square mile of land
Utah population by county, July 2025 (all 29)
Percent change runs from the April 1, 2020 estimates base to July 1, 2025. People per square mile is the July 2025 estimate divided by the county's land area in the Census Bureau's 2020 Gazetteer file, so lakes and bays are left out.
How Utah's population is spread out
Grouping the counties by size shows how concentrated the state is:
| Residents (July 2025) | Counties | Total residents | Share of state |
|---|---|---|---|
| 1,000,000 or more | 1 | 1,220,916 | 34% |
| 250,000 to 999,999 | 3 | 1,419,260 | 40% |
| 100,000 to 249,999 | 2 | 358,670 | 10% |
| 25,000 to 99,999 | 7 | 371,308 | 10% |
| 10,000 to 24,999 | 8 | 130,089 | 4% |
| Under 10,000 | 8 | 38,661 | 1% |
4 counties with at least 250,000 residents hold 75% of the state's population.
Most and least densely populated
The most crowded counties by people per square mile of land:
- Salt Lake County: 1,645 per sq mi (1,220,916 people on 742 sq mi)
- Davis County: 1,275 per sq mi (381,227 people on 299 sq mi)
- Weber County: 483 per sq mi (278,174 people on 576 sq mi)
- Utah County: 379 per sq mi (759,859 people on 2,004 sq mi)
- Cache County: 124 per sq mi (145,000 people on 1,165 sq mi)
The most thinly settled:
- Garfield County: 1.0 per sq mi (5,256 people on 5,175 sq mi)
- Wayne County: 1.1 per sq mi (2,587 people on 2,461 sq mi)
- Daggett County: 1.3 per sq mi (934 people on 697 sq mi)
- San Juan County: 1.9 per sq mi (14,542 people on 7,820 sq mi)
- Piute County: 2.0 per sq mi (1,509 people on 758 sq mi)
About these numbers
- They are estimates. Between censuses the Census Bureau's Population Estimates Program updates county totals each year from births, deaths and migration records. The next full count is the 2030 census.
- The base is April 1, 2020. The estimates start from an April 1, 2020 "estimates base" built from the 2020 census, which is why it is slightly different from the published census count.
- Each new release revises the past. A newer vintage can change earlier years as well, so compare numbers from the same release, as this page does.
- Statewide total. The counties add up exactly to the statewide figure of 3,538,904 in the same file.
Using population numbers in a land search
- Big counties, busy offices. In the most populous counties, parcel maps and deed records are usually online and searchable, but recording and permit offices are busier. Allow for that if you are on a deadline.
- Small counties, fewer sales. In counties with only a few thousand people, land changes hands less often, so there are fewer recent sales to compare a price with. The county assessor's sales records are the best source.
- Density hints at lot size. A low people-per-square-mile figure usually means farms, ranches and timber tracts; a high one means subdivided lots. The parcel viewer shows the actual parcel lines.
- Check the official map. Use the parcel viewer link in the table for boundaries, parcel numbers and owner names, then confirm anything important with the county's recorder or assessor.
Related guides
- Fastest growing counties in Utah
- Largest counties in Utah
- Utah county GIS websites by viewer
- Utah parcel map guide
- Utah statewide parcel map
- Utah landowner maps for hunting
- Most populous counties in the US
- Where people are moving in the US
More: All Utah counties on Platbookmapper
Sources
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2025 (April 1, 2020 estimates base and July 1, 2020–2025 estimates, with components of change). Statewide totals are the sum of the counties and match the file's state row.
- U.S. Census Bureau Gazetteer files, 2020 county land and water area (for people per square mile).
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 24, 2026) for each official parcel viewer.