Plymouth, WA ZIP code
The ZIP code for Plymouth, Washington is 99346. It is in Benton County.
- Population in these ZIPs
- 198
- Avg. median income
- $50,900population-weighted
- Typical home value
- $209,200population-weighted
- Metro area
- Kennewick-Richland, WA
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Plymouth, WA ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 99346 | 198 | $50,865 | $209,200 |
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 Plymouth
Frequently asked questions
What is the ZIP code for Plymouth, WA?
The ZIP code for Plymouth, WA is 99346.
What county is Plymouth, Washington in?
Plymouth ZIP codes are in Benton County.