Dayton ZIP Codes — Columbia County, WA

There is one unique ZIP code in Dayton, Washington and it is 99328. Area code: 509.

ZIP codes

657.29

sq mi land

3.45

sq mi water

509

area code

Dayton, WA ZIP code map

About Dayton, WA

Dayton, Washington, is a charming small city located in the southeastern part of the state, sitting in Columbia County. Known for its picturesque landscapes and rich historical background, Dayton offers a blend of rural charm and modern convenience. It is a welcoming community that reflects the spirit of the Pacific Northwest.

Location & geography

Dayton is situated in Columbia County, which is known for its scenic vistas along the Grande Ronde River. Nearby cities include Walla Walla, located approximately 32 miles to the southwest, Waitsburg at about 12 miles to the south, and Pomeroy approximately 35 miles to the northeast. The city encompasses a total land area of 657.29 square miles and a water area of 3.45 square miles, featuring rolling hills and fertile valleys.

Community & economy

The community in Dayton is characterized by its friendly atmosphere and strong sense of local identity. Agriculture plays an important role in the local economy, along with small businesses that serve both residents and visitors. Daily life in Dayton often centers around community events, local markets, and outdoor activities, reflecting the city's commitment to preserving its natural beauty.

Transportation

Dayton is easily accessible via State Route 12, which connects the city to the larger highway network in Washington. The nearest major airport is Walla Walla Regional Airport, located about 35 miles away, providing regional flights for travelers. Public transit options are limited, making personal vehicles the most common mode of transportation in the area.

History

Dayton was founded in the late 19th century and has a rich agricultural history that has shaped its development. The city originally thrived due to wheat farming and is known for its production of grain and other agricultural products. Notable events in its history include the establishment of the Columbia County Courthouse, which is a significant landmark still in use today.

Did you know?

One surprising fact about Dayton is that it is home to the historic Grand Hotel, which dates back to the late 1800s and serves as a reminder of the city's vibrant past. Additionally, the area's diverse landscape offers residents and visitors alike ample opportunities for outdoor recreation, including hiking and fishing.

ZIP codes for Dayton, WA (1)

ZIP code	City	County	Map
99328	Dayton	Columbia	View map

Demographics & statistics

3,669

Population

50.5

Median age

$69,355

Median household income

$41,467

Per capita income

$224,000

Median home value

$852

Median monthly rent

76.4%

Home ownership

9.0%

Poverty rate

3.2%

Unemployment

1,597

Housing units

25.7%

Bachelor's or higher

Age distribution

Male Female

Under 5

113

5–9

113

10–14

15–19

112

20–24

112

135

25–34

136

200

35–44

201

213

45–54

213

152

55–59

153

159

60–64

160

314

65–74

314

178

75–84

179

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	637	17.4%
18 and over	3,032	82.6%
65 and over	1,055	28.8%
Median age	50.5 years

Race & ethnicity

White 73.6%

Two or more races 11.6%

Hispanic or Latino 9.8%

Other race 4.3%

Black or African American 0.6%

American Indian / Alaska Native 0.1%

Group	Count	%
White	2,992	73.6%
Two or more races	470	11.6%
Hispanic or Latino	397	9.8%
Other race	175	4.3%
Black or African American	24	0.6%
American Indian / Alaska Native	6	0.1%

Household income

Under $10k 3.7%

$10k–$15k 7.6%

$15k–$25k 7.4%

$25k–$35k 5.6%

$35k–$50k 9.0%

$50k–$75k 20.4%

$75k–$100k 14.7%

$100k–$150k 20.9%

$150k–$200k 6.6%

$200k+ 4.1%

Range	% of households
Under $10k	3.7%
$10k–$15k	7.6%
$15k–$25k	7.4%
$25k–$35k	5.6%
$35k–$50k	9.0%
$50k–$75k	20.4%
$75k–$100k	14.7%
$100k–$150k	20.9%
$150k–$200k	6.6%
$200k+	4.1%
Median income	$69,355

Housing

Home values

Under $50k 6.4%

$50k–$100k 9.4%

$100k–$150k 12.9%

$150k–$200k 16.5%

$200k–$300k 18.4%

$300k–$500k 30.4%

$500k–$1M 2.9%

$1M+ 3.2%

Housing overview

Metric	Value
Median home value	$224,000
Median rent / month	$852
Owner occupied	76.4%
Renter occupied	23.6%
Vacant	17.1%
Single-family detached	87.2%
Large apartment buildings	0.0%
Mobile homes	4.1%
Median rooms	5.7
Avg household size (owned)	2.18

Year built

Era	%
2020 or later	0.0%
2010–2019	6.7%
2000–2009	6.5%
1990–1999	4.0%
1980–1989	2.3%
1970–1979	11.3%
1960–1969	6.2%
1950–1959	9.7%
1940–1949	13.1%
1939 or earlier	40.1%

Bedrooms

Size	% of units
No bedroom (studio)	2.4%
1 bedroom	12.3%
2 bedrooms	27.9%
3 bedrooms	35.5%
4 bedrooms	15.8%
5+ bedrooms	6.0%

Vehicles per household

Vehicles	% of households
No vehicle	3.5%
1 vehicle	26.1%
2 vehicles	32.8%
3 or more	37.5%

Heating fuel

Fuel type	%
Utility gas	3.4%
Electricity	74.3%
Propane / LP gas	1.4%
Fuel oil	8.4%
Wood	11.8%

Households & families

Household type	Count	%
Married-couple family	808	49.1%
Cohabiting couple	110	6.7%
Male householder, no spouse	284	17.2%
Female householder, no spouse	445	27.0%
Households with children under 18	390	23.7%
Households with seniors (65+)	703	42.7%
Average household size	2.18

Marital status

Status	Male	Female
Never married	25.5%	24.8%
Married	59.0%	48.9%
Separated	0.0%	0.1%
Widowed	3.4%	14.2%
Divorced	12.1%	11.9%

Education

Less than 9th grade 3.5%

Some HS, no diploma 7.3%

HS graduate 20.2%

Some college, no degree 28.8%

Associate's degree 14.4%

Bachelor's degree 14.8%

Graduate / professional 11.0%

Metric	%
HS diploma or higher	89.2%
Bachelor's or higher	25.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	16	2.6%
Kindergarten	45	7.3%
Elementary school	293	47.8%
High school	89	14.5%
College / grad school	170	27.7%

Employment

Industry of employment

Education & healthcare 28.3%

Retail trade 14.3%

Agriculture & mining 10.8%

Manufacturing 9.7%

Public administration 8.4%

Construction 7.1%

Professional & management 7.0%

Transportation & utilities 4.8%

Other services 4.3%

Finance & real estate 2.5%

Arts, food & hospitality 1.7%

Wholesale trade 0.7%

Information 0.3%

Occupation

Category	%
Management, business & arts	33.6%
Service	17.3%
Sales & office	18.8%
Natural resources & construction	16.9%
Production & transportation	13.4%

Employment type

Type	%
Private sector	62.1%
Government	31.0%
Self-employed	6.8%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	73.6%
Carpool	10.9%
Public transit	0.0%
Walk	6.7%
Other means	3.6%
Avg commute (minutes)	19.1

Poverty

All people 9.0%

Under 18 years 6.3%

18 and over 9.6%

Married-couple families 4.1%

Female-led households 12.5%

Income support

Source	% of households
Social Security	47.0%
Retirement income	27.6%
Supplemental Security	5.2%
Cash public assistance	1.1%
Food stamps / SNAP	12.7%

Health indicators

Condition	%
High blood pressure	34.6%
High cholesterol	36.2%
Heart disease	8.5%
Stroke	4.0%
Asthma	10.9%
Arthritis	30.1%
Kidney disease	3.7%
Pulmonary disease	8.4%
Cancer	9.0%

Behavior / access	%
Binge drinking	14.4%
No physical activity	20.6%
Less than 7 hrs sleep	27.2%
Fair or poor health	16.1%
Poor mental health	14.4%
Poor physical health	12.6%
No health insurance	10.4%
Visited doctor (checkup)	70.9%
Visited dentist	64.2%
Cholesterol screening	90.2%
Teeth loss	12.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	393	13.0%

Disability	%
Any disability	21.8%
Under 18	6.0%
18–64 years	17.5%
65 and over	39.8%

Health insurance coverage

Type	%
Private insurance	59.6%
Public insurance	52.8%
Uninsured under 19	0.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	3,499	95.4%
Spanish	199	5.7%
Other Indo-European	168	4.8%
Asian & Pacific Islander	6	0.2%
Other languages	25	0.7%

Place of birth & citizenship

Origin	Count	%
Native born (US)	3,526	96.1%
Born in same state	3,512	95.7%
Born in different state	2,285	62.3%
Foreign born	14	0.4%
Naturalized citizen	143	3.9%
Not a US citizen	43	30.1%

Ancestry

Ancestry	Count	%
French	575	15.7%
Italian	413	11.3%
Arab	160	4.4%
English	120	3.3%
Polish	87	2.4%

Ancestry	Count	%
Dutch	59	1.6%
German	18	0.5%
Irish	14	0.4%
Norwegian	6	0.2%

Technology access

Metric	% of households
Computer access	44.9%
Internet access	94.0%

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

Frequently asked questions

What ZIP codes does Dayton, WA have?

Dayton, WA has one ZIP code: 99328. Each ZIP code serves a distinct delivery area within the city and surrounding region.