County ZIP codes · Idaho · FIPS 16001
Ada County, ID ZIP Codes
Ada County, Idaho has 37 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 19 residential and 18 for PO boxes or a single organization. 16 of the residential ones lie mainly in Ada County and 3 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $64,731 in 83705 to $128,822 in 83716 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Ada County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $82,893 and $100,091.
They carry 8 postal town names: Meridian, Boise, Nampa, Kuna, Eagle, Garden City, Star, Melba.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 19 residential ZIP codes in Ada County
16 ZIP codes lie mainly in Ada County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 83646 | Meridian | 76,023 | 2,787 | $103k | $543k | 100% |
| 83642 | Meridian | 62,279 | 1,502 | $97k | $534k | 100% |
| 83709 | Boise | 58,928 | 1,749 | $93k | $474k | 100% |
| 83704 | Boise | 42,719 | 4,881 | $73k | $388k | 100% |
| 83634 | Kuna | 36,286 | 232 | $97k | $433k | 95% |
| 83706 | Boise | 35,524 | 4,781 | $83k | $538k | 100% |
| 83616 | Eagle | 35,413 | 318 | $125k | $799k | 64% |
| 83713 | Boise | 31,549 | 4,778 | $91k | $454k | 100% |
| 83714 | Garden City | 27,564 | 509 | $88k | $497k | 100% |
| 83705 | Boise | 26,830 | 1,655 | $65k | $416k | 100% |
| 83702 | Boise | 24,163 | 771 | $86k | $777k | 97% |
| 83703 | Boise | 17,583 | 2,162 | $77k | $508k | 100% |
| 83669 | Star | 16,827 | 765 | $100k | $586k | 66% |
| 83712 | Boise | 9,071 | 395 | $106k | $859k | 100% |
| 83720 | Boise | no residents | 0 | – | – | 100% |
| 83725 | Boise | no residents | 0 | – | – | 100% |
Partly in Ada County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
7 ZIP codes of Ada County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Ada | Elsewhere |
|---|---|---|
| 83687 | 10% | Canyon County 90% |
| 83634 | 95% | Canyon County 5% |
| 83616 | 64% | Gem County 36% |
| 83702 | 97% | Boise County 3% |
| 83716 | 16% | Elmore County 61%; Boise County 24% |
| 83669 | 66% | Canyon County 34% |
| 83641 | 14% | Owyhee County 61%; Canyon County 25% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Ada County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Ada County's ZIP codes use 2 prefixes: 836 and 837.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.