| ZIP Codes: | 18 ZIP Codes (14 Standard, 4 PO Box, 0 Unique) [See All] |
| Area Code: | 435 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:55:24 PM |
| Population: | 61,126 [See All] |
| FIPS: | 49003 |
| CBSA: | Brigham City, UT-ID |
| Land Area: | 5,443 sq mi |
| Water Area: | 51 sq mi |
| Coordinates: | 41.6895, -112.3752 |
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61,126 residents live across 18 ZIPs covering 5,443 sq mi, served by 18 distinct USPS-recognized cities.
Population moved from 50,439 to 61,126 from 2014 to 2024 — a +21.2% change. 13 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 84324 (Mantua, $142,188 median) and poorest ZIP 84311 (Fielding, $77,841) are 26.5 miles apart — a 1.8× income gap across local geography.
Median home values vary 2.1× across this county — from $283,900 in 84329 (Park Valley) to $607,100 in 84324 (Mantua).
Density varies 817× across the county — from 0 people/sq mi in 84329 (Park Valley) to 394 in 84301 (Bear River City).
Educational attainment ranges from 17.3% bachelor's+ in 84311 (Fielding) to 41.4% in 84324 (Mantua) — the breadth of educational profiles across the area.
Within Utah, this is the #9 most populous of 29 counties and ranks #11 for median household income with the #8 fastest decade growth .
Weighted by population, the typical household earns about $85,013 across the county — reflecting what a typical resident sees, not a simple ZIP average.
26.7% of adults age 25+ hold a bachelor's degree or higher (9,872 of 36,913 reporting).
14 Standard delivery, 4 PO Box only, 0 single-entity Unique ZIPs serve this county.
Box Elder County grew 21.2% over the past decade — concentrated in 3 high-growth ZIPs:
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 84302 | Brigham City | Standard | 27,053 | $79,706 | 87.3 | 11.6% |
| 84337 | Tremonton | Standard | 16,199 | $81,683 | 147.2 | 39.4% |
| 84312 | Garland | Standard | 4,857 | $83,088 | 46.0 | 36.9% |
| 84340 | Willard | Standard | 3,744 | $108,304 | 137.9 | 3.6% |
| 84324 | Mantua | Standard | 1,677 | $142,188 | 45.6 | 133.2% |
| 84307 | Corinne | Standard | 1,356 | $80,441 | 816.2 | -1.5% |
| 84311 | Fielding | Standard | 1,013 | $77,841 | 12.6 | 18.5% |
| 84314 | Honeyville | Standard | 964 | $87,578 | 7.4 | 0.9% |
| 84301 | Bear River City | PO Box | 889 | $89,583 | 2.3 | 1.5% |
| 84309 | Deweyville | Standard | 871 | $100,000 | 18.1 | 83.0% |
| 84306 | Collinston | Standard | 521 | $121,250 | 26.7 | 60.3% |
| 84336 | Snowville | Standard | 481 | $89,392 | 727.7 | 37.0% |
| 84329 | Park Valley | Standard | 424 | — | 879.1 | 346.3% |
| 84330 | Plymouth | PO Box | 364 | $86,518 | 9.4 | -9.2% |
| 84316 | Howell | PO Box | 288 | $88,015 | 45.3 | 26.9% |
| 84331 | Portage | Standard | 245 | $65,625 | 247.7 | -18.3% |
| 84334 | Riverside | PO Box | 180 | — | 0.4 | -58.6% |
| 84313 | Grouse Creek | Standard | 0 | — | 2,186.0 | -100.0% |