99403 ZIP Code — Clarkston, WA

Asotin County, Washington

ZIP code 99403 is located in Clarkston, Washington, within Asotin County. It covers approximately 143.49 square miles and serves a population of 20,425 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 509.

About ZIP code 99403

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1970s, giving the area an established character. Median home value is $262,400. Owner-occupancy sits near the national average at 70%.

Median household income is $60,657. SNAP benefit usage at 19% of households reflects economic stress in the area. 44% 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 15 minutes is near the national average.

Educational attainment is near the national average, with 22% of residents holding a bachelor's degree or higher.

Overall, ZIP code 99403 reflects a community defined by a significant Social Security-dependent population and elevated reliance on food assistance.

20,425

population

143.49

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

99403 ZIP code map

Cities in ZIP code 99403

Below are the cities the US Postal Service accepts for ZIP code 99403. Using any city not on this list may result in mail delivery delays.

City	Status
Clarkston	Preferred

Nearby ZIP codes

99402 Asotin (8.4 mi) 99401 Anatone (9.1 mi) 99347 Pomeroy (16.1 mi) 83501 Lewiston (18.1 mi) 99179 Uniontown (19.7 mi)

Demographics updated 05/2026

Population
Total population	20,425
Population density	142 / sq mi
State FIPS	53
County FIPS	003

Geography
Land area	143.49 sq mi
Water area	1.37 sq mi
Latitude	46.2313
Longitude	-117.2574
Timezone	Pacific (PT)
Area code	509

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	47.3%	47.0%	31.7%
$50k – $100k	32.0%	31.4%	30.6%
$100k – $200k	17.0%	17.6%	27.1%
Over $200k	3.6%	4.0%	10.6%

Demographics & statistics

20,425

Population

142

People per sq mi

45.1

Median age

$60,657

Median household income

$35,383

Per capita income

$262,400

Median home value

$941

Median monthly rent

70.3%

Home ownership

17.2%

Poverty rate

6.2%

Unemployment

6,545

Housing units

22.1%

Bachelor's or higher

Age distribution

Male Female

562

Under 5

585

451

5–9

469

590

10–14

614

559

15–19

582

602

20–24

628

1,049

25–34

1,093

1,179

35–44

1,228

1,157

45–54

1,206

647

55–59

674

844

60–64

879

1,303

65–74

1,358

781

75–84

813

280

85+

292

← Male

Female →

Age summary

Group	Count	%
Under 18	4,022	19.7%
18 and over	16,403	80.3%
65 and over	4,827	23.6%
Median age	45.1 years

Race & ethnicity

White 87.1%

Two or more races 5.2%

Hispanic or Latino 3.4%

American Indian / Alaska Native 1.3%

Asian 1.2%

Other race 1.1%

Black or African American 0.7%

Group	Count	%
White	18,434	87.1%
Two or more races	1,096	5.2%
Hispanic or Latino	729	3.4%
American Indian / Alaska Native	271	1.3%
Asian	252	1.2%
Other race	223	1.1%
Black or African American	149	0.7%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	47.3%	47.0%	31.7%
$50k – $100k	32.0%	31.4%	30.6%
$100k – $200k	17.0%	17.6%	27.1%
Over $200k	3.6%	4.0%	10.6%

Under $10k 6.7%

$10k–$15k 3.9%

$15k–$25k 8.1%

$25k–$35k 8.1%

$35k–$50k 15.1%

$50k–$75k 18.9%

$75k–$100k 12.7%

$100k–$150k 14.6%

$150k–$200k 4.7%

$200k+ 7.2%

Range	% of households
Under $10k	6.7%
$10k–$15k	3.9%
$15k–$25k	8.1%
$25k–$35k	8.1%
$35k–$50k	15.1%
$50k–$75k	18.9%
$75k–$100k	12.7%
$100k–$150k	14.6%
$150k–$200k	4.7%
$200k+	7.2%
Median income	$60,657

Housing

Home values

Under $50k 5.1%

$50k–$100k 3.5%

$100k–$150k 8.9%

$150k–$200k 11.6%

$200k–$300k 32.6%

$300k–$500k 28.7%

$500k–$1M 8.5%

$1M+ 1.2%

Housing overview

Metric	Value
Median home value	$262,400
Median rent / month	$941
Owner occupied	70.3%
Renter occupied	29.7%
Vacant	5.2%
Single-family detached	72.5%
Large apartment buildings	2.7%
Mobile homes	9.0%
Median rooms	5.7
Avg household size (owned)	2.29

Year built

Era	%
2020 or later	0.2%
2010–2019	5.9%
2000–2009	9.0%
1990–1999	16.3%
1980–1989	10.9%
1970–1979	18.0%
1960–1969	9.6%
1950–1959	9.9%
1940–1949	7.9%
1939 or earlier	12.1%

Bedrooms

Size	% of units
No bedroom (studio)	2.3%
1 bedroom	7.5%
2 bedrooms	31.2%
3 bedrooms	34.0%
4 bedrooms	20.9%
5+ bedrooms	4.1%

Vehicles per household

Vehicles	% of households
No vehicle	3.0%
1 vehicle	31.2%
2 vehicles	33.6%
3 or more	32.1%

Heating fuel

Fuel type	%
Utility gas	54.1%
Electricity	38.6%
Propane / LP gas	1.8%
Fuel oil	1.4%
Wood	3.3%
No fuel used	0.2%

Households & families

Household type	Count	%
Married-couple family	3,824	44.3%
Cohabiting couple	814	9.4%
Male householder, no spouse	1,495	17.3%
Female householder, no spouse	2,499	29.0%
Households with children under 18	2,047	23.7%
Households with seniors (65+)	3,607	41.8%
Average household size	2.34

Marital status

Status	Male	Female
Never married	29.9%	24.1%
Married	47.1%	44.4%
Separated	2.3%	1.3%
Widowed	4.3%	10.5%
Divorced	16.5%	19.7%

Education

Less than 9th grade 1.6%

Some HS, no diploma 5.2%

HS graduate 31.9%

Some college, no degree 25.8%

Associate's degree 13.3%

Bachelor's degree 13.7%

Graduate / professional 8.4%

Metric	%
HS diploma or higher	93.2%
Bachelor's or higher	22.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	348	9.2%
Kindergarten	222	5.9%
Elementary school	1,682	44.6%
High school	932	24.7%
College / grad school	587	15.6%

Employment

Industry of employment

Education & healthcare 26.1%

Retail trade 11.6%

Manufacturing 11.4%

Arts, food & hospitality 10.4%

Professional & management 8.5%

Construction 7.6%

Finance & real estate 6.4%

Other services 4.8%

Public administration 4.3%

Transportation & utilities 3.5%

Wholesale trade 3.3%

Agriculture & mining 1.9%

Information 0.2%

Occupation

Category	%
Management, business & arts	32.2%
Service	22.6%
Sales & office	21.0%
Natural resources & construction	9.7%
Production & transportation	14.5%

Employment type

Type	%
Private sector	76.3%
Government	16.1%
Self-employed	7.4%
Unpaid family workers	0.2%

Commute

Method	%
Drive alone	79.3%
Carpool	7.5%
Public transit	0.1%
Walk	2.5%
Work from home	10.0%
Other means	0.6%
Avg commute (minutes)	14.6

Poverty

All people 17.2%

Under 18 years 24.9%

18 and over 15.3%

Married-couple families 5.5%

Female-led households 22.4%

Income support

Source	% of households
Social Security	44.3%
Retirement income	35.0%
Supplemental Security	7.2%
Cash public assistance	2.9%
Food stamps / SNAP	19.2%

Health indicators

Condition	%
Obesity	32.5%
High blood pressure	34.6%
High cholesterol	34.9%
Diabetes	11.1%
Heart disease	7.6%
Stroke	3.7%
Asthma	11.7%
Arthritis	30.0%
Kidney disease	3.5%
Pulmonary disease	8.4%
Cancer	7.9%

Behavior / access	%
Smoking	19.3%
Binge drinking	17.0%
No physical activity	22.5%
Less than 7 hrs sleep	29.5%
Depression	27.1%
Fair or poor health	16.2%
Poor mental health	16.0%
Poor physical health	12.7%
No health insurance	11.0%
Visited doctor (checkup)	70.3%
Visited dentist	64.2%
Cholesterol screening	88.0%
Teeth loss	14.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,709	10.4%

Disability	%
Any disability	18.9%
Under 18	6.2%
18–64 years	16.2%
65 and over	36.2%

Health insurance coverage

Type	%
Private insurance	61.5%
Public insurance	51.9%
No insurance	6.8%
Uninsured under 19	0.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	19,278	94.4%
Spanish	271	1.4%
Other Indo-European	151	0.8%
Asian & Pacific Islander	25	0.1%
Other languages	88	0.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	19,774	96.8%
Born in same state	19,678	96.3%
Born in different state	4,806	23.5%
Foreign born	96	0.5%
Naturalized citizen	651	3.2%
Not a US citizen	192	29.5%

Ancestry

Ancestry	Count	%
French	2,766	13.5%
Italian	2,484	12.2%
Arab	1,252	6.1%
Polish	691	3.4%

Ancestry	Count	%
English	275	1.3%
German	173	0.8%
Dutch	153	0.7%
Irish	48	0.2%

Technology access

Metric	% of households
Computer access	42.3%
Internet access	94.3%

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

Frequently asked questions about ZIP code 99403

What city is ZIP code 99403 in?

ZIP code 99403 is primarily assigned to Clarkston, Washington.

What county is ZIP code 99403 in?

ZIP code 99403 falls within Asotin County, Washington.

Does ZIP code 99403 have a large retiree population?

44% of households in ZIP code 99403 receive Social Security income, suggesting a significant retiree or disability population.

What is the poverty rate in ZIP code 99403?

17% of residents in ZIP code 99403 live below the poverty line, above the national average.

Does ZIP code 99403 have a large veteran population?

10% of civilians in ZIP code 99403 are veterans, above the national average of ~7%.

What is the population of ZIP code 99403?

ZIP code 99403 has an estimated population of 20,425 residents, with a density of 142 people per square mile.

What timezone is ZIP code 99403 in?

ZIP code 99403 observes the PST timezone.