Residential delivery area · Washington
ZIP Code 98611: Castle Rock, WA
ZIP code 98611 uses the postal name Castle Rock, Washington and lies entirely in Cowlitz County (Census 2020 ZIP-county file). About 9,300 people live there (Census Bureau, ACS 2020-2024). Median household income is $86,322 (Census Bureau, ACS 2020-2024). By Census place, 2% of its land lies in Castle Rock; 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Castle Rock · its only residential ZIP
- County
- Cowlitz County
- Census places
- Castle Rock
- Metro area
- Longview-Kelso, WA
- House district
- WA-3 119th Congress
- State
- Washington
- Time zone
- Pacific
- Land area
- 136.1 sq mi · 68 people per sq mi
Where is ZIP code 98611?
98611 centers on 46.305°, -122.901° and covers 136.1 square miles of land plus 1.5 of water. It borders 7 ZIP codes: 98645, 98593, 98581, 98632, 98626, 98591, 98649.
The map draws ZIP code areas only. For the streets inside 98611, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 98611 compare with the rest of Cowlitz County?
| Measure | 98611 | In Cowlitz County | In WA |
|---|---|---|---|
| People (ACS 2020-2024) | 9,302 | 4th of 12 | 240th of 605 |
| Median household income | $86k | 5th of 7 | 216th of 363 |
| Median home value | $426k | 5th of 7 | 266th of 392 |
Its median household income is higher than in 69% of U.S. residential ZIP codes, and it is denser than 48% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 98611?
The 2020 Census counted 10,165 people in 98611; the ACS, which samples households over 2020-2024, estimates 9,302. Between the 2010 and 2020 censuses its population grew 11.3% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 9,302±986 (90% margin)
- 2020 Census count
- 10,165+11.3% since 2010 (9,133)
- Households
- 3,539
- Median age
- 43.7
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 98611?
Of the 9,302 people the ACS estimates in 98611, 23.4% are under 18 and 23.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (87.2%).
- Under 1823.4%
- 18 to 6453.2%
- 65 and older23.4%
- White, not Hispanic87.2%
- Other or two or more9.9%
- Hispanic or Latino1.8%
- Asian, not Hispanic0.9%
- Black, not Hispanic0.2%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 98611 earn?
Median household income is $86,322 (ACS 2020-2024), the 5th highest of the 7 ranked ZIP codes in Cowlitz County. It is not measurably different from 2015-2019 ($81,179 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $86,322±$12,746
- Income per person
- $37,729
- Below the poverty line
- 8.5%
- Unemployed (of the labor force)
- 4.7%
- Adults 25+ with a bachelor's degree
- 14.9%
- Adjusted gross income per tax return, 2022
- $78,4155,050 returns; wages 68% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 98611?
FHFA's house price index for 98611, built from repeat sales and appraisals of the same homes, rose 109% from 2015 to 2025 and rose 45% from 2020 to 2025, and moved +6.5% in 2025.
- Median home value (owners' estimate)
- $425,700
- Median gross rent
- $1,250
- Homes owned by their occupants
- 83.8%
- Housing units
- 3,723
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 98611?
160 business establishments had a location in this ZIP code in 2023, 11 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction32
- Accommodation and food services22
- Retail trade18
- Agriculture, forestry, fishing and hunting17
- Other services (except public administration)16
- Professional, scientific, and technical services11
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 98611?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 98645 | Silverlake | 2,216 | $101k | 7.0 mi |
| 98593 | Vader | 1,541 | $84k | 8.5 mi |
| 98581 | Ryderwood | 419 | $43k | 8.8 mi |
| 98632 | Longview | 50,635 | $66k | 10.4 mi |
| 98626 | Kelso | 26,892 | $76k | 11.0 mi |
| 98591 | Toledo | 3,965 | $79k | 12.0 mi |
| 98649 | Toutle | 929 | $74k | 17.6 mi |
| 98596 | Winlock | 6,950 | $80k | 13.2 mi (near) |
| 98609 | Carrolls | 0 | – | 16.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.