Box Elder County area

Population and density of Box Elder County

The Census Bureau estimates that 65,320 people lived in Box Elder County on July 1, 2025. That ranks #851 of 3,222 county equivalents nationally and #9 of 29 in Utah. Since the April 1, 2020 estimates base of 57,668, the population has grown by 7,652 (+13.3%), compared with +8.2% for Utah as a whole.

With 5,781.3 square miles of land, that is 11 people per square mile (4.4 per km²), placing Box Elder County #2,597 nationally for density and #15 in Utah. The median county equivalent has 47 people per square mile; the Utah median is 11. Put another way, there are about 57 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Box Elder County

16 incorporated places lie at least partly in Box Elder County. Together they are home to 53,878 people (82.5%); the other 11,442 (17.5%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Brigham City city, with 20,633 residents in the county. By land, Howell town is the largest at 35.3 mi². Among places with at least 1,000 residents in 2020, Tremonton city grew fastest since then (+30.7%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Box Elder County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Box Elder County is a central county of the Brigham City, UT-ID Micropolitan Statistical Area. Its 2 county equivalents have 70,405 residents on 6,980.3 square miles of land; Box Elder County accounts for 82.8% of the land and 92.8% of the residents. By combined land it ranks #10 of 542 micropolitan areas, and #108 by population. It belongs to the Salt Lake City-Provo-Orem, UT-ID Combined Statistical Area.

ZIP codes

20 ZIP Code Tabulation Areas have land in Box Elder County; 18 of them have most of their land inside the county, and the others mainly cover neighboring areas.

8334284029843018430284306843078430984311843128431384314843168432484329843308433184334843368433784340

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Box Elder County

Box Elder County shares a land border with 6 county equivalents, including 3 in Nevada and Idaho. It has more land than 4 of them. The largest neighbor is Elko County (17,173.3 mi²) and the smallest is Weber County (611 mi²). Together with its neighbors, Box Elder County forms a block of 35,535.1 mi² of land, of which it holds 16.3%.

How big is Box Elder County compared with U.S. states?

Box Elder County has more land than 3 of the 50 states. It is about 1.2 times the land area of Connecticut (4,842.5 mi²), while Hawaii, the next larger state, has 1.1 times as much land (6,422.6 mi²). Utah’s county land could hold about 14 areas the size of Box Elder County.

Another way to picture it: the same land area would fill a square about 76 miles (122.4 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Box Elder County?

Box Elder County has more land than 3,158 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Box Elder County at #54 nationally by total area, 10 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.

Its water share is 14.1%, compared with a national county-equivalent median of 1.2% — 12.9 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Box Elder County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.