99113 ZIP Code — Colton, WA

Whitman County, Washington

ZIP code 99113 is located in Colton, Washington, within Whitman County. It covers approximately 98.49 square miles and serves a population of 555 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 509.

About ZIP code 99113

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $301,300. Owner-occupancy is high at 85%, well above the national average.

Median household income is $82,292. 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 22 minutes is near the national average.

Educational attainment is near the national average, with 37% of residents holding a bachelor's degree or higher.

Overall, ZIP code 99113 reflects a community defined by high homeownership and a significant Social Security-dependent population.

555

population

98.49

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

99113 ZIP code map

Cities in ZIP code 99113

Below are the cities the US Postal Service accepts for ZIP code 99113. Using any city not on this list may result in mail delivery delays.

City	Status
Colton	Preferred

Nearby ZIP codes

99179 Uniontown (7 mi) 99163 Pullman (10.8 mi) 99164 Pullman (11.6 mi) 83844 Moscow (16 mi) 83832 Genesee (16.2 mi) 83843 Moscow (18.2 mi)

Demographics updated 05/2026

Population
Total population	555
Population density	6 / sq mi
State FIPS	53
County FIPS	075

Geography
Land area	98.49 sq mi
Water area	2.21 sq mi
Latitude	46.5687
Longitude	-117.2380
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	39.8%	55.9%	31.7%
$50k – $100k	43.2%	24.5%	30.6%
$100k – $200k	15.2%	15.6%	27.1%
Over $200k	1.9%	4.0%	10.6%

Demographics & statistics

555

Population

People per sq mi

53.0

Median age

$82,292

Median household income

$41,765

Per capita income

$301,300

Median home value

$938

Median monthly rent

84.7%

Home ownership

0.9%

Poverty rate

1.9%

Unemployment

232

Housing units

36.7%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	98	17.7%
18 and over	457	82.3%
65 and over	183	33.0%
Median age	53.0 years

Race & ethnicity

White 89%

Two or more races 6.9%

Black or African American 2.1%

Hispanic or Latino 1.4%

Other race 0.5%

Group	Count	%
White	501	89%
Two or more races	39	6.9%
Black or African American	12	2.1%
Hispanic or Latino	8	1.4%
Other race	3	0.5%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	39.8%	55.9%	31.7%
$50k – $100k	43.2%	24.5%	30.6%
$100k – $200k	15.2%	15.6%	27.1%
Over $200k	1.9%	4.0%	10.6%

Under $10k 1.2%

$15k–$25k 3.7%

$25k–$35k 12.4%

$35k–$50k 20.2%

$50k–$75k 6.6%

$75k–$100k 22.7%

$100k–$150k 15.3%

$150k–$200k 9.9%

$200k+ 7.9%

Range	% of households
Under $10k	1.2%
$15k–$25k	3.7%
$25k–$35k	12.4%
$35k–$50k	20.2%
$50k–$75k	6.6%
$75k–$100k	22.7%
$100k–$150k	15.3%
$150k–$200k	9.9%
$200k+	7.9%
Median income	$82,292

Housing

Home values

$50k–$100k 3.4%

$100k–$150k 9.3%

$150k–$200k 6.8%

$200k–$300k 30.2%

$300k–$500k 22.0%

$500k–$1M 22.4%

$1M+ 5.9%

Housing overview

Metric	Value
Median home value	$301,300
Median rent / month	$938
Owner occupied	84.7%
Renter occupied	15.3%
Vacant	10.0%
Single-family detached	94.1%
Large apartment buildings	0.0%
Mobile homes	3.0%
Median rooms	7.2
Avg household size (owned)	2.38

Year built

Era	%
2020 or later	0.0%
2010–2019	2.2%
2000–2009	8.9%
1990–1999	10.8%
1980–1989	1.5%
1970–1979	23.8%
1960–1969	4.1%
1950–1959	3.3%
1940–1949	7.1%
1939 or earlier	38.3%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	0.4%
2 bedrooms	20.4%
3 bedrooms	31.2%
4 bedrooms	34.2%
5+ bedrooms	13.8%

Vehicles per household

Vehicles	% of households
No vehicle	0.8%
1 vehicle	19.4%
2 vehicles	47.9%
3 or more	31.8%

Heating fuel

Fuel type	%
Utility gas	40.9%
Electricity	40.1%
Fuel oil	9.9%
Wood	9.1%

Households & families

Household type	Count	%
Married-couple family	147	60.7%
Cohabiting couple	6	2.5%
Male householder, no spouse	37	15.3%
Female householder, no spouse	52	21.5%
Households with children under 18	51	21.1%
Households with seniors (65+)	108	44.6%
Average household size	2.29

Marital status

Status	Male	Female
Never married	28.5%	9.2%
Married	64.3%	67.7%
Separated	1.6%	0.0%
Widowed	0.8%	10.5%
Divorced	4.8%	12.7%

Education

Less than 9th grade 0.0%

Some HS, no diploma 4.7%

HS graduate 15.1%

Some college, no degree 29.2%

Associate's degree 14.3%

Bachelor's degree 24.1%

Graduate / professional 12.7%

Metric	%
HS diploma or higher	95.3%
Bachelor's or higher	36.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	10	11.0%
Kindergarten	6	6.6%
Elementary school	44	48.4%
High school	21	23.1%
College / grad school	10	11.0%

Employment

Industry of employment

Education & healthcare 35.9%

Agriculture & mining 18.0%

Manufacturing 12.1%

Retail trade 9.8%

Professional & management 5.9%

Transportation & utilities 4.3%

Construction 3.5%

Finance & real estate 3.5%

Wholesale trade 2.3%

Arts, food & hospitality 2.3%

Other services 1.6%

Public administration 0.8%

Occupation

Category	%
Management, business & arts	49.6%
Service	9.0%
Sales & office	23.0%
Natural resources & construction	7.8%
Production & transportation	10.5%

Employment type

Type	%
Private sector	52.7%
Government	34.8%
Self-employed	12.5%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	67.2%
Carpool	13.7%
Public transit	0.4%
Walk	12.4%
Work from home	5.8%
Other means	0.4%
Avg commute (minutes)	22.2

Poverty

All people 0.9%

Under 18 years 0.0%

18 and over 1.1%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	46.7%
Retirement income	42.6%
Supplemental Security	3.3%
Cash public assistance	3.7%
Food stamps / SNAP	2.9%

Health indicators

Condition	%
Obesity	32.1%
High blood pressure	32.3%
High cholesterol	35.8%
Diabetes	9.0%
Heart disease	6.5%
Stroke	3.0%
Asthma	10.8%
Arthritis	26.4%
Kidney disease	3.0%
Pulmonary disease	6.6%
Cancer	7.6%

Behavior / access	%
Smoking	14.6%
Binge drinking	17.2%
No physical activity	17.4%
Less than 7 hrs sleep	27.6%
Depression	26.2%
Fair or poor health	12.9%
Poor mental health	14.3%
Poor physical health	10.7%
No health insurance	8.5%
Visited doctor (checkup)	70.9%
Visited dentist	72.0%
Cholesterol screening	90.4%
Teeth loss	9.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	47	10.3%

Disability	%
Any disability	15.9%
Under 18	6.1%
18–64 years	9.1%
65 and over	31.1%

Health insurance coverage

Type	%
Private insurance	85.9%
Public insurance	47.0%
No insurance	3.4%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	534	96.2%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	551	99.3%
Born in same state	547	98.6%
Born in different state	250	45.0%
Foreign born	4	0.7%
Naturalized citizen	4	0.7%
Not a US citizen	4	100.0%

Ancestry

Ancestry	Count	%
French	117	21.1%
Polish	59	10.6%
Italian	41	7.4%

Ancestry	Count	%
English	6	1.1%
Dutch	2	0.4%
Arab	2	0.4%

Technology access

Metric	% of households
Computer access	43.6%
Internet access	100.0%

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

Frequently asked questions about ZIP code 99113

What city is ZIP code 99113 in?

ZIP code 99113 is primarily assigned to Colton, Washington.

What county is ZIP code 99113 in?

ZIP code 99113 falls within Whitman County, Washington.

Does ZIP code 99113 have an older population?

33% of residents in ZIP code 99113 are 65 or older, above the national average of ~17%.

Does ZIP code 99113 have a large retiree population?

47% of households in ZIP code 99113 receive Social Security income, suggesting a significant retiree or disability population.

Is ZIP code 99113 mostly owner-occupied?

85% of occupied units in ZIP code 99113 are owner-occupied, well above the national average.

Does ZIP code 99113 have a large veteran population?

10% of civilians in ZIP code 99113 are veterans, above the national average of ~7%.

What timezone is ZIP code 99113 in?

ZIP code 99113 observes the PST timezone.