| ZIP Codes: | 6 ZIP Codes (6 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 208 / 986 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:11:56 PM |
| Population: | 6,053 [See All] |
| FIPS: | 16015 |
| CBSA: | Boise City, ID |
| Land Area: | 1,355 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 44.0484, -115.9042 |
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6,053 residents live across 6 ZIPs covering 1,355 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 4,586 to 6,053 from 2014 to 2024 — a +32.0% change. 4 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 83631 (Idaho City, $80,714 median) and poorest ZIP 83637 (Lowman, $46,944) are 27.6 miles apart — a 1.7× income gap across local geography.
Median home values vary 3.2× across this county — from $178,100 in 83637 (Lowman) to $576,800 in 83622 (Garden Valley).
Density varies 18× across the county — from 1 people/sq mi in 83637 (Lowman) to 9 in 83629 (Horseshoe Bend).
Educational attainment ranges from 8.8% bachelor's+ in 83637 (Lowman) to 33.8% in 83622 (Garden Valley) — the breadth of educational profiles across the area.
Within Idaho, this is the #38 most populous of 46 counties and ranks #32 for median household income with the #2 fastest decade growth .
On the national stage, Boise County is and #48 for decade growth .
Weighted by population, the typical household earns about $71,678 across the county — reflecting what a typical resident sees, not a simple ZIP average.
27.7% of adults age 25+ hold a bachelor's degree or higher (1,345 of 4,847 reporting).
6 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
Boise County grew 32.0% over the past decade — concentrated in 2 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 |
|---|---|---|---|---|---|---|
| 83622 | Garden Valley | Standard | 2,132 | $65,625 | 377.3 | 45.2% |
| 83631 | Idaho City | Standard | 1,916 | $80,714 | 276.6 | 70.6% |
| 83629 | Horseshoe Bend | Standard | 1,749 | $72,500 | 186.9 | 6.5% |
| 83637 | Lowman | Standard | 226 | $46,944 | 442.6 | -24.9% |
| 83666 | Placerville | Standard | 30 | $63,125 | 16.3 | 15.4% |
| 83602 | Banks | Standard | 0 | — | 55.0 | -100.0% |