Castle Rock is a city in Cowlitz County, Washington, home to about 2,217 people across 2.1 square miles. It has no ZIP code of its own: it’s part of 98611.
Homes sold for a median of $273 per square foot in the three months ending August 2026, a balanced market.
Each card is that ZIP code’s whole market, including any part outside Castle Rock. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Castle Rock’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Castle Rock well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Portland International Airport (PDX)50 miles away |
|---|---|
| Nearest city of 250,000+ | Portland, OR53 miles away |
Straight-line distances from the center of Castle Rock; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Castle Rock had 2,446 residents in the 2020 census, up 15% since 2000.
It’s the 300th largest of 628 towns in Washington by population.
Cowlitz County grew from 7,877 residents in 1900 to 110,730 in 2020.
Cowlitz County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 80°F in summer, and winter lows average 35°F. About 48 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Longview, WA weather station (9 miles away).
33,796 jobs at 2,309 businesses in Cowlitz County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
25 doctors and other health care providers list an office in Castle Rock.
Nearest hospitals
Providers with an office here
| Primary care doctors | 4 |
|---|---|
| Specialist doctors | 1 |
| Dentists | 1 |
| Nurse practitioners and physician assistants | 4 |
| Mental health providers | 10 |
| Physical and occupational therapists | 4 |
| Chiropractors | 1 |
| Pharmacies | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (6 nearby)
Grocery stores (1 nearby)
Pharmacies (1 nearby)
Libraries (1 nearby)
Museums (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Castle Rock School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Castle Rock ElementaryCastle Rock | Pre-K–5 | 733 | Public | 0.7 mi |
| Castle Rock Virtual AcademyCastle Rock | K–12 | 13 | Alternative Education | 0.3 mi |
| Castle Rock Middle SchoolCastle Rock | 6–8 | 316 | Public | 0.5 mi |
| Castle Rock High SchoolCastle Rock | 9–12 | 422 | Public | 0.3 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
Buying or selling around Castle Rock? Tell us what you need and when. No agents advertise here yet, so we’ll keep your request for up to 30 days and send it to local agents who join. No obligation, and you choose who to work with.
Loading map…
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.