98611 ZIP Code — Castle Rock, WA

Cowlitz County, Washington

ZIP code 98611 is located in Castle Rock, Washington, within Cowlitz County. It covers approximately 136.13 square miles and serves a population of 9,341 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 360/564.

About ZIP code 98611

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $350,100. Owner-occupancy is high at 83%, well above the national average.

Median household income is $83,207. SNAP benefit usage at 18% of households reflects economic stress in the area. 47% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 31 minutes is near the national average.

College attainment at 13% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 98611 reflects a community defined by a trades-oriented workforce, high homeownership, a significant Social Security-dependent population, and elevated reliance on food assistance.

9,341

population

136.13

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

98611 ZIP code map

Cities in ZIP code 98611

Below are the cities the US Postal Service accepts for ZIP code 98611. Using any city not on this list may result in mail delivery delays.

City	Status
Castle Rock	Preferred

Nearby ZIP codes

98593 Vader (11 mi) 98626 Kelso (11.3 mi) 98581 Ryderwood (11.4 mi) 98632 Longview (11.5 mi) 98591 Toledo (12.4 mi) 98596 Winlock (13.7 mi) 98609 Carrolls (15.3 mi) 97048 Rainier (17.4 mi) 98542 Ethel (17.7 mi) 98649 Toutle (17.9 mi) 98625 Kalama (17.9 mi) 98582 Salkum (18 mi)

Demographics updated 05/2026

Population
Total population	9,341
Population density	69 / sq mi
State FIPS	53
County FIPS	015

Geography
Land area	136.13 sq mi
Water area	1.47 sq mi
Latitude	46.2936
Longitude	-122.8635
Timezone	Pacific (PT)
Area code	360/564

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	34.8%	43.2%	31.7%
$50k – $100k	39.8%	32.8%	30.6%
$100k – $200k	21.6%	19.8%	27.1%
Over $200k	3.8%	4.2%	10.6%

Demographics & statistics

9,341

Population

People per sq mi

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

Income range	This ZIP	County avg	State avg
Under $50k	34.8%	43.2%	31.7%
$50k – $100k	39.8%	32.8%	30.6%
$100k – $200k	21.6%	19.8%	27.1%
Over $200k	3.8%	4.2%	10.6%

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%
Work from home	8.3%
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	%
Obesity	36.3%
High blood pressure	34.9%
High cholesterol	34.6%
Diabetes	9.5%
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	%
Smoking	17.8%
Binge drinking	17.6%
No physical activity	18.5%
Less than 7 hrs sleep	36.3%
Depression	29.9%
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%
No insurance	4.1%
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 about ZIP code 98611

What city is ZIP code 98611 in?

ZIP code 98611 is primarily assigned to Castle Rock, Washington.

What county is ZIP code 98611 in?

ZIP code 98611 falls within Cowlitz County, Washington.

Does ZIP code 98611 have a large retiree population?

47% of households in ZIP code 98611 receive Social Security income, suggesting a significant retiree or disability population.

How educated is the population of ZIP code 98611?

13% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Is ZIP code 98611 mostly owner-occupied?

83% of occupied units in ZIP code 98611 are owner-occupied, well above the national average.

What is the typical home value in ZIP code 98611?

The median home value in ZIP code 98611 is $350,100.

What timezone is ZIP code 98611 in?

ZIP code 98611 observes the PST timezone.