County facts · Land area · October 22, 2026
Largest Counties in Utah by Area and Population
The largest Utah counties by land area and by 2023 population, plus the smallest, county seats and a link to each official parcel map.
Looking for the largest counties in Utah? Utah has 29 counties covering about 82,377 square miles of land, based on the Census Bureau's 2020 Gazetteer. The largest by land area is San Juan County, at about 7,820 square miles, roughly 26 times the size of the smallest, Davis County (299 sq mi). Measured by people instead, the largest is Salt Lake County, with about 1,185,813 residents in the Census Bureau's July 1, 2023 estimate.
The tables below rank the counties both ways. Each row links to the county's Platbookmapper page and straight to its official parcel viewer.
Utah counties at a glance
- Counties: 29
- Land area: about 82,377 sq mi, plus about 2,521 sq mi of water inside county lines
- Residents, 2023 estimates: about 3,417,734, or about 41 people per square mile of land
- Median county land area: about 2,427 sq mi
- With a verified public parcel viewer in our directory: 28 of 29 (8 of them through a statewide viewer)
The 10 largest Utah counties by land area
| # | County | Seat | Land (sq mi) | 2023 pop. | People per sq mi | Parcel viewer |
|---|---|---|---|---|---|---|
| 1 | San Juan County | Monticello | 7,820 | 14,358 | 1.8 | Utah State Parcels viewer |
| 2 | Tooele County | Tooele | 6,942 | 82,051 | 12 | ArcGIS Web AppBuilder |
| 3 | Millard County | Fillmore | 6,786 | 13,437 | 2.0 | Utah State Parcels viewer |
| 4 | Box Elder County | Brigham City | 5,746 | 62,684 | 11 | ArcGIS Experience Builder |
| 5 | Garfield County | Panguitch | 5,175 | 5,314 | 1.0 | county web map |
| 6 | Uintah County | Vernal | 4,482 | 37,747 | 8.4 | ArcGIS Web AppBuilder |
| 7 | Emery County | Castle Dale | 4,462 | 10,144 | 2.3 | ArcGIS Experience Builder |
| 8 | Kane County | Kanab | 3,990 | 8,425 | 2.1 | listed link under review |
| 9 | Grand County | Moab | 3,673 | 9,706 | 2.6 | ArcGIS Web AppBuilder |
| 10 | Juab County | Nephi | 3,392 | 13,023 | 3.8 | Utah State Parcels viewer |
Together these 10 cover about 64% of Utah's land area and hold about 8% of its residents.
The 10 most populous Utah counties
| # | County | Seat | 2023 pop. | Land (sq mi) | Parcel viewer |
|---|---|---|---|---|---|
| 1 | Salt Lake County | Salt Lake City | 1,185,813 | 742 | county web map |
| 2 | Utah County | Provo | 719,174 | 2,004 | county web map |
| 3 | Davis County | Farmington | 373,207 | 299 | county web map |
| 4 | Weber County | Ogden | 271,926 | 576 | county web map |
| 5 | Washington County | St. George | 202,452 | 2,427 | county web map |
| 6 | Cache County | Logan | 142,393 | 1,165 | ArcGIS Experience Builder |
| 7 | Tooele County | Tooele | 82,051 | 6,942 | ArcGIS Web AppBuilder |
| 8 | Iron County | Parowan | 64,211 | 3,296 | ArcGIS Experience Builder |
| 9 | Box Elder County | Brigham City | 62,684 | 5,746 | ArcGIS Experience Builder |
| 10 | Summit County | Coalville | 42,759 | 1,871 | ArcGIS Web AppBuilder |
These 10 hold about 92% of Utah's residents in the 2023 estimates.
The 5 smallest Utah counties by land area
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Davis County | Farmington | 299 | 373,207 | county web map |
| Weber County | Ogden | 576 | 271,926 | county web map |
| Morgan County | Morgan | 609 | 13,000 | ArcGIS Experience Builder |
| Daggett County | Manila | 697 | 992 | ArcGIS Web AppBuilder |
| Salt Lake County | Salt Lake City | 742 | 1,185,813 | county web map |
Most and least crowded
- Most people per square mile: Salt Lake County, about 1,598 (then Davis County, 1,248, and Weber County, 472)
- Fewest people per square mile: Garfield County, about 1.0 (then Wayne County, 1.1, and Daggett County, 1.4)
Counties with the most water
The Census Bureau reports water separately from land. It counts lakes, reservoirs, rivers and, along a coast or a Great Lake, the water inside the boundary.
- Box Elder County: about 984 sq mi of water, 15% of its total area
- Tooele County: about 344 sq mi of water, 5% of its total area
- Davis County: about 336 sq mi of water, 53% of its total area
Using these numbers in a land search
- Land area is not parcel count. A large rural county can hold fewer parcels than a small suburban one, so size alone says little about how busy its parcel map is.
- Search, don't scroll. In a big county, type an address, owner name or parcel number into the viewer's search box, where it has one, instead of panning across the map.
- Records follow the county line. Deeds, plats and tax bills are kept by the county where the parcel sits, so a tract that crosses a county line usually has a parcel number on each side.
- Rounded figures. Land and water areas are rounded to whole square miles (one decimal for very small places). People per square mile is the 2023 estimate divided by land area.
Related guides
- Utah county GIS websites by viewer
- Utah parcel map guide
- Utah statewide parcel map
- Utah landowner maps for hunting
- Colorado–Utah border counties
- Largest county in each state
- Largest counties in the US by land area
More: All Utah counties on Platbookmapper
Sources
- U.S. Census Bureau Gazetteer files, 2020 county land and water area.
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2023 (July 1, 2023 estimates)
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 22, 2026) for each official parcel viewer.
- County seats: Wikidata (county seat property), cross-checked against Census place names.