County ProfileWA
Cowlitz County
Population: 110,730 · 11 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
110,730
People
Median age
41.5
Housing
Total households
43,943
Income
Median household income
$76,531
Housing
Total housing units
46,422
Employment
Employment rate
53.3%
Education
Bachelor’s degree or higher
17.6%
Healthcare
Insured population
93.8%
County details
Local time 23:43:18(PT)| Name | Cowlitz |
|---|---|
| Total ZIP codes | 11total |
| ZIP codes (by type) | 11 Standard |
| Area code | 360, 509, 564 |
| Timezone | Pacific Time (PT) |
| Coordinates | 46.1967854, -122.6784596 |
| Land area | 1,141.2 sq miles(2,955.6 km²) |
Map of Cowlitz county, Washington with ZIP codes
Cities and Communities in Cowlitz County
Compare the largest cities in Cowlitz County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Cowlitz County
Review the most populated postal areas across Cowlitz County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 98632 | Longview | $66,305 | 50,721 |
| 98626 | Kelso | $75,528 | 26,291 |
| 98674 | Woodland | $94,245 | 14,415 |
| 98611 | Castle Rock | $86,322 | 10,165 |
| 98625 | Kalama | $116,435 | 7,413 |
| 98645 | Silverlake | $101,429 | 1,811 |
| 98649 | Toutle | $73,750 | 1,134 |
| 98603 | Ariel | $78,281 | 1,018 |
| 98581 | Ryderwood | $43,009 | 421 |
| 98616 | Cougar | — | 200 |
| 98609 | Carrolls | — | 65 |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS