Colfax ZIP Codes — Whitman County, WA

There is one unique ZIP code in Colfax, Washington and it is 99111. Area code: 509.

ZIP codes

306.99

sq mi land

0.10

sq mi water

509

area code

Colfax, WA ZIP code map

About Colfax, WA

Colfax is a charming city located in Whitman County, Washington, known for its historical significance and picturesque landscapes. As the county seat, it serves as a hub for the surrounding agricultural community. With a rich history and a welcoming atmosphere, Colfax offers residents and visitors a unique blend of small-town charm and diverse cultural experiences.

Location & geography

Colfax is situated in the southeastern part of Washington State, approximately 25 miles south of Pullman and just 12 miles east of Washington State University. The city has a total land area of 306.99 square miles, with a small water area of 0.10 square miles, highlighting its predominantly terrestrial landscape. The terrain around Colfax is characterized by rolling hills and fertile agricultural land, making it a vital area for local farming.

Community & economy

The community of Colfax is known for its friendly atmosphere and strong sense of local pride. Agriculture plays a significant role in the local economy, with many residents engaged in farming and related industries. Daily life in Colfax is vibrant and community-oriented, with various events and local gatherings that strengthen the relationships among its residents.

Transportation

Colfax is easily accessible via major highways, including U.S. Route 195, which runs through the city and connects to nearby towns. The nearest named airport is Pullman-Moscow Regional Airport, located approximately 25 miles away, providing convenient access for air travel. Local transportation options are typically limited to personal vehicles and public bus services that connect to regional sites.

History

Colfax was founded in the late 19th century and has since grown to be a significant agricultural center in the region. The town was named after Schuyler Colfax, the 17th Vice President of the United States, who played a role in the expansion of the West. Notable events in the city's history include its establishment as the county seat and its ongoing development as a center of commerce in Whitman County.

Did you know?

One surprising fact about Colfax is that it was once home to the largest grain elevator in the Pacific Northwest, which highlights its importance in regional agriculture. Additionally, the city hosts the annual Colfax Rodeo, an event that draws visitors from all around and showcases local culture and heritage.

ZIP codes for Colfax, WA (1)

ZIP code	City	County	Map
99111	Colfax	Whitman	View map

Demographics & statistics

4,012

Population

45.0

Median age

$61,223

Median household income

$35,965

Per capita income

$237,000

Median home value

$841

Median monthly rent

70.9%

Home ownership

9.4%

Poverty rate

2.5%

Unemployment

1,377

Housing units

29.7%

Bachelor's or higher

Age distribution

Male Female

Under 5

106

5–9

113

115

10–14

121

153

15–19

162

20–24

162

25–34

171

326

35–44

344

192

45–54

202

160

55–59

170

235

60–64

248

193

65–74

205

121

75–84

128

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	835	20.8%
18 and over	3,177	79.2%
65 and over	799	19.9%
Median age	45.0 years

Race & ethnicity

White 81.5%

Hispanic or Latino 7.2%

Two or more races 6.6%

Other race 2%

American Indian / Alaska Native 1.2%

Black or African American 0.9%

Asian 0.6%

Group	Count	%
White	3,522	81.5%
Hispanic or Latino	310	7.2%
Two or more races	286	6.6%
Other race	87	2%
American Indian / Alaska Native	51	1.2%
Black or African American	41	0.9%
Asian	25	0.6%

Household income

Under $10k 5.7%

$10k–$15k 2.2%

$15k–$25k 10.2%

$25k–$35k 8.5%

$35k–$50k 11.2%

$50k–$75k 21.9%

$75k–$100k 10.9%

$100k–$150k 18.0%

$150k–$200k 6.7%

$200k+ 4.8%

Range	% of households
Under $10k	5.7%
$10k–$15k	2.2%
$15k–$25k	10.2%
$25k–$35k	8.5%
$35k–$50k	11.2%
$50k–$75k	21.9%
$75k–$100k	10.9%
$100k–$150k	18.0%
$150k–$200k	6.7%
$200k+	4.8%
Median income	$61,223

Housing

Home values

Under $50k 5.6%

$50k–$100k 10.5%

$100k–$150k 5.8%

$150k–$200k 18.6%

$200k–$300k 23.3%

$300k–$500k 25.3%

$500k–$1M 10.2%

$1M+ 0.7%

Housing overview

Metric	Value
Median home value	$237,000
Median rent / month	$841
Owner occupied	70.9%
Renter occupied	29.1%
Vacant	12.8%
Single-family detached	63.1%
Large apartment buildings	8.7%
Mobile homes	10.5%
Median rooms	5.8
Avg household size (owned)	2.82

Year built

Era	%
2020 or later	0.0%
2010–2019	2.7%
2000–2009	3.0%
1990–1999	14.5%
1980–1989	5.7%
1970–1979	11.2%
1960–1969	11.4%
1950–1959	8.5%
1940–1949	9.5%
1939 or earlier	33.5%

Bedrooms

Size	% of units
No bedroom (studio)	4.1%
1 bedroom	9.7%
2 bedrooms	23.0%
3 bedrooms	34.6%
4 bedrooms	20.7%
5+ bedrooms	7.9%

Vehicles per household

Vehicles	% of households
No vehicle	6.9%
1 vehicle	38.5%
2 vehicles	32.3%
3 or more	22.3%

Heating fuel

Fuel type	%
Utility gas	39.0%
Electricity	43.2%
Propane / LP gas	4.3%
Fuel oil	3.2%
Wood	9.9%

Households & families

Household type	Count	%
Married-couple family	755	46.9%
Cohabiting couple	42	2.6%
Male householder, no spouse	275	17.1%
Female householder, no spouse	537	33.4%
Households with children under 18	374	23.2%
Households with seniors (65+)	633	39.3%
Average household size	2.44

Marital status

Status	Male	Female
Never married	32.1%	19.9%
Married	49.4%	47.7%
Separated	1.0%	0.0%
Widowed	1.9%	15.5%
Divorced	15.5%	17.0%

Education

Less than 9th grade 1.8%

Some HS, no diploma 5.9%

HS graduate 24.2%

Some college, no degree 24.4%

Associate's degree 14.0%

Bachelor's degree 18.4%

Graduate / professional 11.3%

Metric	%
HS diploma or higher	92.2%
Bachelor's or higher	29.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	47	5.8%
Elementary school	378	46.6%
High school	241	29.7%
College / grad school	145	17.9%

Employment

Industry of employment

Education & healthcare 28.7%

Retail trade 17.7%

Construction 8.6%

Manufacturing 7.9%

Agriculture & mining 7.8%

Public administration 6.9%

Arts, food & hospitality 6.2%

Professional & management 5.2%

Other services 4.7%

Finance & real estate 2.9%

Transportation & utilities 1.9%

Information 1.0%

Wholesale trade 0.5%

Occupation

Category	%
Management, business & arts	41.9%
Service	18.9%
Sales & office	15.6%
Natural resources & construction	14.4%
Production & transportation	9.2%

Employment type

Type	%
Private sector	69.0%
Government	24.7%
Self-employed	6.2%
Unpaid family workers	0.2%

Commute

Method	%
Drive alone	72.9%
Carpool	10.1%
Public transit	2.3%
Walk	3.8%
Other means	5.3%
Avg commute (minutes)	24.2

Poverty

All people 9.4%

Under 18 years 10.5%

18 and over 9.1%

Married-couple families 3.3%

Female-led households 22.0%

Income support

Source	% of households
Social Security	41.8%
Retirement income	28.0%
Supplemental Security	5.7%
Cash public assistance	3.3%
Food stamps / SNAP	10.4%

Health indicators

Condition	%
High blood pressure	32.9%
High cholesterol	34.2%
Heart disease	7.2%
Stroke	3.3%
Asthma	10.5%
Arthritis	27.0%
Kidney disease	3.2%
Pulmonary disease	6.8%
Cancer	8.2%

Behavior / access	%
Binge drinking	16.8%
No physical activity	18.7%
Less than 7 hrs sleep	27.3%
Fair or poor health	13.3%
Poor mental health	14.2%
Poor physical health	10.7%
No health insurance	9.4%
Visited doctor (checkup)	71.1%
Visited dentist	71.0%
Cholesterol screening	89.5%
Teeth loss	10.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	395	12.4%

Disability	%
Any disability	19.8%
Under 18	2.0%
18–64 years	16.8%
65 and over	48.6%

Health insurance coverage

Type	%
Private insurance	74.2%
Public insurance	40.5%
Uninsured under 19	1.4%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	3,859	96.2%
Spanish	66	1.7%
Other Indo-European	34	0.9%
Asian & Pacific Islander	10	0.3%
Other languages	22	0.6%

Place of birth & citizenship

Origin	Count	%
Native born (US)	3,899	97.2%
Born in same state	3,774	94.1%
Born in different state	2,176	54.2%
Foreign born	125	3.1%
Naturalized citizen	113	2.8%
Not a US citizen	51	45.1%

Ancestry

Ancestry	Count	%
Arab	413	10.3%
French	367	9.1%
Italian	319	8%
Polish	182	4.5%

Ancestry	Count	%
English	44	1.1%
Dutch	38	0.9%
German	10	0.2%
Norwegian	8	0.2%

Technology access

Metric	% of households
Computer access	40.1%
Internet access	88.9%

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

Frequently asked questions

What ZIP codes does Colfax, WA have?

Colfax, WA has one ZIP code: 99111. Each ZIP code serves a distinct delivery area within the city and surrounding region.