Castle Rock ZIP Codes — Cowlitz County, WA

There is one unique ZIP code in Castle Rock, Washington and it is 98611. Area code: 360/564.

ZIP codes

136.13

sq mi land

1.47

sq mi water

360/564

area code

Castle Rock, WA ZIP code map

About Castle Rock, WA

Castle Rock, Washington, is a charming city located in Cowlitz County, known for its picturesque landscapes and community spirit. Nestled near the banks of the Cowlitz River, it offers residents and visitors alike a serene environment filled with outdoor activities. With a distinctive small-town feel, Castle Rock boasts a rich history and a welcoming atmosphere.

Location & geography

Castle Rock is situated in the southwestern part of Washington State, approximately 25 miles north of Portland, Oregon, and 10 miles south of Longview. The city encompasses a land area of 136.13 square miles, with an additional 1.47 square miles designated as water. The surrounding landscape features lush forests and hills, contributing to the area's natural beauty.

Community & economy

The community of Castle Rock is characterized by its friendly residents and strong local connections, creating a supportive environment for families and individuals. The local economy thrives on a mix of industries including timber, agriculture, and small businesses that cater to the needs of the community. Daily life in Castle Rock is enhanced by local events and festivals that celebrate its unique heritage and bring residents together.

Transportation

Castle Rock is conveniently accessible via Interstate 5, which runs north-south through the city and connects it to larger urban centers. The closest major airport is the Portland International Airport, located about 30 miles to the south, providing easy travel options for residents and visitors. Public transportation options are limited, but local services do connect to nearby areas.

History

Founded in the late 19th century, Castle Rock's early economy was driven primarily by the timber industry, taking advantage of the area's rich natural resources. Key events in its history include the establishment of the town's founding families and the growth of agriculture alongside the timber sector. Over the years, Castle Rock has evolved while maintaining its historical roots, becoming a vibrant community.

Did you know?

A little-known fact about Castle Rock is that it is named after the notable 'Castle Rock' formation, a prominent basalt outcropping in the area that has become a local landmark. The city also hosts the annual 'Castle Rock Cowlitz River Fishing Derby,' attracting anglers from various regions.

ZIP codes for Castle Rock, WA (1)

ZIP code	City	County	Map
98611	Castle Rock	Cowlitz	View map

Demographics & statistics

9,341

Population

42.0

Median age

$83,207

Median household income

$35,206

Per capita income

$350,100

Median home value

$1,156

Median monthly rent

83.4%

Home ownership

7.6%

Poverty rate

4.2%

Unemployment

2,931

Housing units

12.8%

Bachelor's or higher

Age distribution

Male Female

309

Under 5

338

238

5–9

261

351

10–14

384

203

15–19

223

175

20–24

192

628

25–34

688

491

35–44

539

465

45–54

510

373

55–59

410

263

60–64

288

615

65–74

674

297

75–84

326

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	2,160	23.1%
18 and over	7,181	76.9%
65 and over	2,012	21.5%
Median age	42.0 years

Race & ethnicity

White 87.5%

Two or more races 4.8%

Hispanic or Latino 3.1%

American Indian / Alaska Native 1.6%

Other race 1.6%

Native Hawaiian / Pacific Islander 0.9%

Asian 0.3%

Black or African American 0.1%

Group	Count	%
White	8,434	87.5%
Two or more races	464	4.8%
Hispanic or Latino	300	3.1%
American Indian / Alaska Native	159	1.6%
Other race	157	1.6%
Native Hawaiian / Pacific Islander	87	0.9%
Asian	26	0.3%
Black or African American	14	0.1%

Household income

Under $10k 4.6%

$10k–$15k 1.7%

$15k–$25k 6.1%

$25k–$35k 8.4%

$35k–$50k 6.2%

$50k–$75k 17.1%

$75k–$100k 16.7%

$100k–$150k 21.6%

$150k–$200k 7.0%

$200k+ 10.6%

Range	% of households
Under $10k	4.6%
$10k–$15k	1.7%
$15k–$25k	6.1%
$25k–$35k	8.4%
$35k–$50k	6.2%
$50k–$75k	17.1%
$75k–$100k	16.7%
$100k–$150k	21.6%
$150k–$200k	7.0%
$200k+	10.6%
Median income	$83,207

Housing

Home values

Under $50k 2.4%

$50k–$100k 2.5%

$100k–$150k 4.1%

$150k–$200k 6.5%

$200k–$300k 25.2%

$300k–$500k 42.3%

$500k–$1M 15.6%

$1M+ 1.4%

Housing overview

Metric	Value
Median home value	$350,100
Median rent / month	$1,156
Owner occupied	83.4%
Renter occupied	16.6%
Vacant	4.5%
Single-family detached	76.4%
Large apartment buildings	2.2%
Mobile homes	15.4%
Median rooms	5.9
Avg household size (owned)	2.80

Year built

Era	%
2020 or later	1.3%
2010–2019	8.1%
2000–2009	13.3%
1990–1999	20.9%
1980–1989	8.6%
1970–1979	17.3%
1960–1969	7.3%
1950–1959	5.0%
1940–1949	6.9%
1939 or earlier	11.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.6%
1 bedroom	5.6%
2 bedrooms	21.7%
3 bedrooms	53.2%
4 bedrooms	12.6%
5+ bedrooms	6.4%

Vehicles per household

Vehicles	% of households
No vehicle	3.3%
1 vehicle	19.6%
2 vehicles	35.7%
3 or more	41.3%

Heating fuel

Fuel type	%
Utility gas	3.1%
Electricity	87.8%
Propane / LP gas	1.9%
Wood	7.0%
No fuel used	0.1%

Households & families

Household type	Count	%
Married-couple family	1,926	57.9%
Cohabiting couple	289	8.7%
Male householder, no spouse	465	14.0%
Female householder, no spouse	646	19.4%
Households with children under 18	1,032	31.0%
Households with seniors (65+)	1,398	42.0%
Average household size	2.79

Marital status

Status	Male	Female
Never married	20.5%	22.6%
Married	59.5%	54.6%
Separated	0.9%	3.3%
Widowed	8.1%	8.4%
Divorced	11.0%	11.1%

Education

Less than 9th grade 1.8%

Some HS, no diploma 7.2%

HS graduate 38.7%

Some college, no degree 26.4%

Associate's degree 13.0%

Bachelor's degree 7.3%

Graduate / professional 5.5%

Metric	%
HS diploma or higher	91.0%
Bachelor's or higher	12.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	126	6.4%
Kindergarten	105	5.3%
Elementary school	1,063	54.0%
High school	317	16.1%
College / grad school	358	18.2%

Employment

Industry of employment

Education & healthcare 20.4%

Manufacturing 16.3%

Construction 11.1%

Transportation & utilities 11.0%

Retail trade 9.7%

Public administration 7.6%

Professional & management 7.4%

Arts, food & hospitality 6.2%

Other services 4.2%

Finance & real estate 3.0%

Agriculture & mining 2.0%

Wholesale trade 1.0%

Information 0.1%

Occupation

Category	%
Management, business & arts	30.7%
Service	16.5%
Sales & office	14.7%
Natural resources & construction	15.9%
Production & transportation	22.2%

Employment type

Type	%
Private sector	78.2%
Government	17.6%
Self-employed	4.2%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	84.3%
Carpool	4.8%
Public transit	0.3%
Walk	1.1%
Other means	1.2%
Avg commute (minutes)	30.9

Poverty

All people 7.6%

Under 18 years 7.0%

18 and over 7.8%

Married-couple families 1.8%

Female-led households 28.2%

Income support

Source	% of households
Social Security	46.9%
Retirement income	38.8%
Supplemental Security	10.2%
Cash public assistance	4.8%
Food stamps / SNAP	18.4%

Health indicators

Condition	%
High blood pressure	34.9%
High cholesterol	34.6%
Heart disease	7.0%
Stroke	3.2%
Asthma	11.9%
Arthritis	29.1%
Kidney disease	3.0%
Pulmonary disease	7.3%
Cancer	7.6%

Behavior / access	%
Binge drinking	17.6%
No physical activity	18.5%
Less than 7 hrs sleep	36.3%
Fair or poor health	14.0%
Poor mental health	15.1%
Poor physical health	11.2%
No health insurance	10.1%
Visited doctor (checkup)	70.5%
Visited dentist	67.0%
Cholesterol screening	89.3%
Teeth loss	11.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	728	10.2%

Disability	%
Any disability	18.9%
Under 18	2.0%
18–64 years	16.2%
65 and over	43.9%

Health insurance coverage

Type	%
Private insurance	68.7%
Public insurance	50.7%
Uninsured under 19	2.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	8,694	93.1%
Spanish	37	0.4%
Other Indo-European	24	0.3%
Asian & Pacific Islander	0	0.0%
Other languages	13	0.1%

Place of birth & citizenship

Origin	Count	%
Native born (US)	9,265	99.2%
Born in same state	9,166	98.1%
Born in different state	5,357	57.3%
Foreign born	99	1.1%
Naturalized citizen	76	0.8%
Not a US citizen	53	69.7%

Ancestry

Ancestry	Count	%
French	1,647	17.6%
Italian	1,280	13.7%
Arab	607	6.5%
Polish	364	3.9%

Ancestry	Count	%
English	247	2.6%
German	102	1.1%
Dutch	46	0.5%
Irish	33	0.4%

Technology access

Metric	% of households
Computer access	35.6%
Internet access	95.7%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Castle Rock, WA have?

Castle Rock, WA has one ZIP code: 98611. Each ZIP code serves a distinct delivery area within the city and surrounding region.