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County ZIP codes · Washington · FIPS 53015

Cowlitz County, WA ZIP Codes

Cowlitz County, Washington has 12 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 10 of the residential ones lie mainly in Cowlitz County and 2 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $66,305 in 98632 (Longview) to $116,435 in 98625 (Kalama) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Cowlitz County?

98581 · Ryderwood: $43k98601 · Amboy: $107k98603 · Ariel: $78k98609 · Carrolls: –98611 · Castle Rock: $86k98616 · Cougar: –98625 · Kalama: $116k98626 · Kelso: $76k98632 · Longview: $66k98645 · Silverlake: $101k98649 · Toutle: $74k98674 · Woodland: $94k986259863298649986119861698674986039862698601985819864598581 · Ryderwood: $43k98601 · Amboy: $107k98603 · Ariel: $78k98609 · Carrolls: –98611 · Castle Rock: $86k98616 · Cougar: –98625 · Kalama: $116k98626 · Kelso: $76k98632 · Longview: $66k98645 · Silverlake: $101k98649 · Toutle: $74k98674 · Woodland: $94k986259863298649986119861698674986039862698601985819864598581 · Ryderwood: $43k98601 · Amboy: $107k98603 · Ariel: $78k98609 · Carrolls: –98611 · Castle Rock: $86k98616 · Cougar: –98625 · Kalama: $116k98626 · Kelso: $76k98632 · Longview: $66k98645 · Silverlake: $101k98649 · Toutle: $74k98674 · Woodland: $94k98625986329864998611986169867498603986269860198581
The residential ZIP codes of Cowlitz County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024).<$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $75,528 and $101,429.

They carry 12 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 12 residential ZIP codes in Cowlitz County

10 ZIP codes lie mainly in Cowlitz County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Cowlitz County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
98632 Longview 50,635 417 $66k $379k 100%
98626 Kelso 26,892 200 $76k $369k 100%
98674 Woodland 17,525 203 $94k $538k 63%
98611 Castle Rock 9,302 68 $86k $426k 100%
98625 Kalama 7,655 39 $116k $513k 100%
98645 Silverlake 2,216 146 $101k $510k 100%
98603 Ariel 1,267 11 $78k $465k 100%
98649 Toutle 929 5 $74k $394k 100%
98581 Ryderwood 419 14 $43k $233k 100%
98609 Carrolls no residents 0 – – 100%

Partly in Cowlitz County

Residential ZIP codes mainly in another county that reach at least 1% into Cowlitz County, by their share here
In this county
98601 Amboy 2,585 83 $107k $515k 9%
98616 Cougar 192 2 – – 2%

Download the 12 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

3 ZIP codes of Cowlitz County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Cowlitz County and in the neighboring counties
ZIPIn CowlitzElsewhere
9867463%Clark County37%
986019%Clark County91%
986162%Skamania County98%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Cowlitz County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Cowlitz County's ZIP codes use 2 prefixes: 985 and 986.

Three-digit prefixes of Cowlitz County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Cowlitz County's
PrefixSectional centerHereAll codes
985Tacoma, WA (SCF 983)177
986Portland, OR (SCF 970)1162

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.