Farmington, WA ZIP code
The ZIP code for Farmington, Washington is 99128. It is in Whitman County.
- Population in these ZIPs
- 259
- Avg. median income
- $58,900population-weighted
- Typical home value
- $300,300population-weighted
- Metro area
- Pullman, WA
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Farmington, WA ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 99128 | 259 | $58,942 | $300,300 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Farmington
Frequently asked questions
What is the ZIP code for Farmington, WA?
The ZIP code for Farmington, WA is 99128.
What county is Farmington, Washington in?
Farmington ZIP codes are in Whitman County.