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Washington ZIP Codes
Whitman County
Colfax, WA
99111
99111 ZIP Code — Colfax, WA
Whitman County, Washington
ZIP code 99111 is located in
Colfax ,
Washington ,
within Whitman County .
It covers approximately 306.99 square miles and serves a population of
4,012 residents.
This is a standard ZIP code in the Pacific (PT) timezone,
served by area code 509 .
About ZIP code 99111
The housing stock consists of a mix of housing types. Most homes were built in the pre-1940, giving the area an established character. Median home value is $237,000. Owner-occupancy sits near the national average at 71%.
Median household income is $61,223. 42% 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 24 minutes is near the national average.
Educational attainment is near the national average, with 30% of residents holding a bachelor's degree or higher.
Notable community characteristics include a notable veteran presence at 12% of civilians, above the national average of 7%.
Overall, ZIP code 99111 reflects a community defined by a strong veteran community and a significant Social Security-dependent population.
99111 ZIP code map
View map of 99111
Cities in ZIP code 99111
Below are the cities the US Postal Service accepts for ZIP code 99111. Using any city not on this list may result in mail delivery delays.
Nearby ZIP codes
Demographics
updated 05/2026
Population
Total population
4,012
Population density
13 / sq mi
State FIPS
53
County FIPS
075
Geography
Land area
306.99 sq mi
Water area
0.10 sq mi
Latitude
46.8668
Longitude
-117.4512
Timezone
Pacific (PT)
Area code
509
Economics
updated 05/2026
Household income
Income range
This ZIP
County avg
State avg
Under $50k
40.3%
55.9%
31.7%
$50k – $100k
35.8%
24.5%
30.6%
$100k – $200k
22.1%
15.6%
27.1%
Over $200k
1.8%
4.0%
10.6%
Demographics & statistics
$61,223
Median household income
$237,000
Median home value
29.7%
Bachelor's or higher
Age distribution
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
American Indian / Alaska Native
1.2%
Black or African American
0.9%
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
Income range
This ZIP
County avg
State avg
Under $50k
40.3%
55.9%
31.7%
$50k – $100k
35.8%
24.5%
30.6%
$100k – $200k
22.1%
15.6%
27.1%
Over $200k
1.8%
4.0%
10.6%
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
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
Some college, no degree
24.4%
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%
Agriculture & mining
7.8%
Public administration
6.9%
Arts, food & hospitality
6.2%
Professional & management
5.2%
Finance & real estate
2.9%
Transportation & utilities
1.9%
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% Work from home 5.5% Other means 5.3% Avg commute (minutes) 24.2
Poverty
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 % Obesity 30.9% High blood pressure 32.9% High cholesterol 34.2% Diabetes 9.1% 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 % Smoking 14.5% Binge drinking 16.8% No physical activity 18.7% Less than 7 hrs sleep 27.3% Depression 25.6% 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% No insurance 4.1% 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 about ZIP code 99111
What city is ZIP code 99111 in?
ZIP code 99111 is primarily assigned to Colfax, Washington.
What county is ZIP code 99111 in?
ZIP code 99111 falls within Whitman County, Washington.
Does ZIP code 99111 have a large retiree population?
42% of households in ZIP code 99111 receive Social Security income, suggesting a significant retiree or disability population.
Does ZIP code 99111 have a large veteran population?
12% of civilians in ZIP code 99111 are veterans, above the national average of ~7%.
What is the population of ZIP code 99111?
ZIP code 99111 has an estimated population of 4,012 residents, with a density of 13 people per square mile.
What is the median household income in ZIP code 99111?
The median household income in ZIP code 99111 is $61,223, below the national median of ~$75,000.
What timezone is ZIP code 99111 in?
ZIP code 99111 observes the PST timezone.
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