Cowlitz County, Washington ZIP codes
10 ZIP codes are in Cowlitz County, plus 2 that cross in from neighboring counties. It's part of the Longview-Kelso, WA metro area.
- ZIP codes
- 10
- Population in these ZIPs
- 116,840
- Avg. median income
- $78,300population-weighted
- Cities & towns
- 10
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Cowlitz County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 98581 | Ryderwood | 419 | $43,009 | $262,400 |
| 98603 | Ariel | 1,267 | $78,281 | $554,000 |
| 98609 | Carrolls | 0 | — | — |
| 98611 | Castle Rock | 9,302 | $86,322 | $475,900 |
| 98625 | Kalama | 7,655 | $116,435 | $538,700 |
| 98626 | Kelso | 26,892 | $75,528 | $387,000 |
| 98632 | Longview | 50,635 | $66,305 | $387,000 |
| 98645 | Silverlake | 2,216 | $101,429 | $482,700 |
| 98649 | Toutle | 929 | $73,750 | $503,200 |
| 98674 | Woodland | 17,525 | $94,245 | $585,000 |
ZIP codes partly in Cowlitz County
These ZIP codes are mostly in a neighboring county but cover part of Cowlitz County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 98601 | Amboy | Clark County | 2,585 | $106,776 | $694,800 |
| 98616 | Cougar | Skamania County | 192 | — | $279,100 |
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 and towns in Cowlitz County
Nearby counties
Frequently asked questions
How many ZIP codes are in Cowlitz County, Washington?
10 ZIP codes are mainly in Cowlitz County, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in Cowlitz County?
ZIP codes in Cowlitz County use the city names Ariel, Carrolls, Castle Rock, Kalama, Kelso, Longview, Ryderwood, Silverlake, Toutle and Woodland.
What metro area is Cowlitz County in?
Cowlitz County is part of the Longview-Kelso, WA metropolitan statistical area.