Cowlitz County, WA ZIP codes
There are 10 ZIP codes in Cowlitz County, WA, in 10 towns, from 98581 to 98674. The largest are 98632 (Longview), 98626 (Kelso) and 98674 (Woodland).
The county seat is Kelso.
- ZIP codes
- 10
- Towns
- 10
- County seat
- Kelso
- County FIPS
53015- State
- Washington
- Population
- 112,360
- Median household income
- $76,531
- Land area
- 1,141 sq mi
- Metro area
- Longview-Kelso
Cowlitz County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Cowlitz County ZIP codes
The ZIP codes of Cowlitz County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Cowlitz County in numbers
About 112,360 people live in Cowlitz County, in 43,943 households, the 12th most populous of Washington's 39 counties. The median household income is $76,531 a year, 22% below the Washington median of $98,141 (US: $80,734). The median owner-occupied home is valued at $397,500 (30% below the Washington median), and median gross rent is $1,206 a month. The median age is 41.5; 17.6% of adults 25 and over hold a bachelor's degree or higher (39.6% across Washington); the average commute takes 26 minutes.
| Population | 112,360 |
|---|---|
| Households | 43,943 |
| Median age | 41.5 |
| Median household income | $76,531 |
| Median home value | $397,500 |
| Median gross rent | $1,206 |
| Bachelor's degree or higher | 17.6% |
| Mean commute | 26.1 min |
| Population density | 98 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Cowlitz County
| Town | ZIP codes | Population |
|---|---|---|
| Longview | 1 | 38,069 |
| Kelso | 1 | 12,684 |
| Woodland | 1 | 6,487 |
| Kalama | 1 | 3,050 |
| Castle Rock | 1 | 2,217 |
| Silverlake | 1 | 2,216 |
| Ariel | 1 | 1,267 |
| Toutle | 1 | 929 |
| Ryderwood | 1 | 401 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Cowlitz County.
Not sure you are in Cowlitz County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Cowlitz County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
98581 | Ryderwood , WA | Standard | 419 | $43,009 | $232,500 |
98603 | Ariel , WA | Standard | 1,267 | $78,281 | $464,500 |
98609 | Carrolls , WA | Standard | 0 | — | — |
98611 | Castle Rock , WA | Standard | 9,302 | $86,322 | $425,700 |
98625 | Kalama , WA | Standard | 7,655 | $116,435 | $513,200 |
98626 | Kelso , WA | Standard | 26,892 | $75,528 | $368,900 |
98632 | Longview , WA | Standard | 50,635 | $66,305 | $379,200 |
98645 | Silverlake , WA | Standard | 2,216 | $101,429 | $509,500 |
98649 | Toutle , WA | Standard | 929 | $73,750 | $393,800 |
98674 | Woodland , WA | Standard | 17,525 | $94,245 | $538,000 |
Cite this page
zipcodes.pro. “Cowlitz County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/wa/county/cowlitz
Underlying data is public domain or openly licensed — sources, vintages and licences.