| ZIP Codes: | 34 ZIP Codes (16 Standard, 8 PO Box, 10 Unique) [See All] |
| Area Codes: | 208 / 986 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:53:13 PM |
| Population: | 522,161 [See All] |
| FIPS: | 16001 |
| CBSA: | Boise City, ID |
| Land Area: | 1,443 sq mi |
| Water Area: | 14 sq mi |
| Coordinates: | 43.6124, -116.2455 |
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522,161 residents live across 34 ZIPs covering 1,443 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 412,830 to 522,161 from 2014 to 2024 — a +26.5% change. 14 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 83716 (Boise, $128,822 median) and poorest ZIP 83705 (Boise, $64,731) are 14.0 miles apart — a 2.0× income gap across local geography.
Median home values vary 2.2× across this county — from $388,000 in 83704 (Boise) to $859,000 in 83712 (Boise).
Density varies 170× across the county — from 29 people/sq mi in 83716 (Boise) to 4,873 in 83704 (Boise).
Educational attainment ranges from 23.0% bachelor's+ in 83634 (Kuna) to 64.6% in 83712 (Boise) — the breadth of educational profiles across the area.
Within Idaho, this is the #1 most populous of 46 counties and ranks #2 for median household income with the #6 fastest decade growth .
On the national stage, Ada County is and #86 for decade growth .
Hosts 4 single-entity Unique ZIPs: 83724Federal Bldg ; 83720Idaho State House ; 83725Boise State University ; and 83735Id State Dept Of Employ .
Weighted by population, the typical household earns about $94,259 across the county — reflecting what a typical resident sees, not a simple ZIP average.
44.5% of adults age 25+ hold a bachelor's degree or higher (160,857 of 361,498 reporting). The most-educated ZIPs cluster around Boise.
16 Standard delivery, 8 PO Box only, 10 single-entity Unique ZIPs serve this county.
2 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
10 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Ada County grew 26.5% over the past decade — concentrated in 5 high-growth ZIPs:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 83646 | Meridian | Standard | 76,023 | $102,861 | 26.8 | 46.0% |
| 83642 | Meridian | Standard | 62,279 | $96,909 | 41.0 | 61.8% |
| 83709 | Boise | Standard | 58,928 | $92,786 | 33.6 | 11.4% |
| 83704 | Boise | Standard | 42,719 | $73,390 | 8.8 | 5.4% |
| 83634 | Kuna | Standard | 36,286 | $97,171 | 257.2 | 38.3% |
| 83706 | Boise | Standard | 35,524 | $82,893 | 7.6 | 10.1% |
| 83616 | Eagle | Standard | 35,413 | $125,203 | 108.0 | 48.5% |
| 83713 | Boise | Standard | 31,549 | $91,295 | 6.6 | 11.4% |
| 83714 | Garden City | Standard | 27,564 | $87,651 | 66.1 | 35.9% |
| 83705 | Boise | Standard | 26,830 | $64,731 | 12.9 | -0.1% |
| 83702 | Boise | Standard | 24,163 | $85,733 | 70.8 | 6.1% |
| 83716 | Boise | Standard | 21,402 | $128,822 | 747.1 | 35.9% |
| 83703 | Boise | Standard | 17,583 | $76,910 | 8.3 | 10.7% |
| 83669 | Star | Standard | 16,827 | $100,091 | 22.6 | 91.8% |
| 83712 | Boise | Standard | 9,071 | $105,574 | 24.8 | 15.5% |
| 83720 | Boise | Unique | 0 | — | 0.0 | — |
| 83725 | Boise | Unique | 0 | — | 0.0 | — |
| 83735 | Boise | Unique | — | — | 0.0 | — |
| 83711 | Boise | PO Box | — | — | 0.0 | — |
| 83701 | Boise | PO Box | — | — | 0.0 | — |
| 83707 | Boise | PO Box | — | — | 0.0 | — |
| 83726 | Boise | Unique | — | — | 0.0 | — |
| 83732 | Boise | Unique | — | — | 0.0 | — |
| 83722 | Boise | Unique | — | — | 0.0 | — |
| 83756 | Boise | Unique | — | — | 0.0 | — |
| 83729 | Boise | Unique | — | — | 0.0 | — |
| 83799 | Boise | PO Box | — | — | 0.0 | — |
| 83680 | Meridian | PO Box | — | — | 0.0 | — |
| 83717 | Boise | PO Box | — | — | 0.0 | — |
| 83715 | Boise | PO Box | — | — | 0.0 | — |
| 83708 | Boise | Standard | — | — | 0.0 | — |
| 83719 | Boise | PO Box | — | — | 0.0 | — |
| 83728 | Boise | Unique | — | — | 0.0 | — |
| 83724 | Boise | Unique | — | — | 0.1 | — |