99171 ZIP Code — Saint John, WA

Whitman County, Washington

ZIP code 99171 is located in Saint John, Washington, within Whitman County. It covers approximately 250.28 square miles and serves a population of 969 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 509.

About ZIP code 99171

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 $209,600. Owner-occupancy sits near the national average at 73%.

Median household income is $68,269. 48% 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 disability rates above the national average at 26%.

969

population

250.28

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

99171 ZIP code map

Cities in ZIP code 99171

Below are the cities the US Postal Service accepts for ZIP code 99171. Using any city not on this list may result in mail delivery delays.

City	Status
Saint John	Preferred

Nearby ZIP codes

99017 Lamont (8.1 mi) 99125 Endicott (12.5 mi) 99170 Rosalia (15.8 mi) 99158 Oakesdale (17 mi) 99111 Colfax (17.3 mi)

Demographics updated 05/2026

Population
Total population	969
Population density	4 / sq mi
State FIPS	53
County FIPS	075

Geography
Land area	250.28 sq mi
Water area	3.71 sq mi
Latitude	47.0875
Longitude	-117.6252
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	40.6%	55.9%	31.7%
$50k – $100k	39.5%	24.5%	30.6%
$100k – $200k	19.9%	15.6%	27.1%
Over $200k	0.0%	4.0%	10.6%

Demographics & statistics

969

Population

People per sq mi

55.5

Median age

$68,269

Median household income

$31,249

Per capita income

$209,600

Median home value

$903

Median monthly rent

73.0%

Home ownership

10.5%

Poverty rate

5.1%

Unemployment

383

Housing units

29.6%

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	158	16.3%
18 and over	811	83.7%
65 and over	320	33.0%
Median age	55.5 years

Race & ethnicity

White 93.7%

Black or African American 3.4%

Two or more races 2.1%

Asian 0.4%

Hispanic or Latino 0.2%

American Indian / Alaska Native 0.2%

Group	Count	%
White	910	93.7%
Black or African American	33	3.4%
Two or more races	20	2.1%
Asian	4	0.4%
Hispanic or Latino	2	0.2%
American Indian / Alaska Native	2	0.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	40.6%	55.9%	31.7%
$50k – $100k	39.5%	24.5%	30.6%
$100k – $200k	19.9%	15.6%	27.1%
Over $200k	0.0%	4.0%	10.6%

Under $10k 6.2%

$10k–$15k 1.4%

$15k–$25k 13.6%

$25k–$35k 6.7%

$35k–$50k 9.1%

$50k–$75k 20.6%

$75k–$100k 16.5%

$100k–$150k 20.1%

$150k–$200k 4.3%

$200k+ 1.4%

Range	% of households
Under $10k	6.2%
$10k–$15k	1.4%
$15k–$25k	13.6%
$25k–$35k	6.7%
$35k–$50k	9.1%
$50k–$75k	20.6%
$75k–$100k	16.5%
$100k–$150k	20.1%
$150k–$200k	4.3%
$200k+	1.4%
Median income	$68,269

Housing

Home values

Under $50k 5.6%

$50k–$100k 12.8%

$100k–$150k 15.4%

$150k–$200k 10.8%

$200k–$300k 35.7%

$300k–$500k 13.8%

$500k–$1M 4.9%

$1M+ 1.0%

Housing overview

Metric	Value
Median home value	$209,600
Median rent / month	$903
Owner occupied	73.0%
Renter occupied	27.0%
Vacant	15.7%
Single-family detached	84.1%
Large apartment buildings	1.2%
Mobile homes	7.7%
Median rooms	6.5
Avg household size (owned)	2.44

Year built

Era	%
2020 or later	0.0%
2010–2019	0.4%
2000–2009	5.2%
1990–1999	10.1%
1980–1989	8.9%
1970–1979	13.3%
1960–1969	4.0%
1950–1959	10.5%
1940–1949	17.9%
1939 or earlier	29.6%

Bedrooms

Size	% of units
No bedroom (studio)	2.2%
1 bedroom	5.0%
2 bedrooms	28.0%
3 bedrooms	38.9%
4 bedrooms	14.3%
5+ bedrooms	11.5%

Vehicles per household

Vehicles	% of households
No vehicle	7.2%
1 vehicle	22.5%
2 vehicles	37.1%
3 or more	33.3%

Heating fuel

Fuel type	%
Utility gas	33.3%
Electricity	47.4%
Propane / LP gas	6.7%
Fuel oil	6.0%
Wood	5.5%

Households & families

Household type	Count	%
Married-couple family	213	51.0%
Cohabiting couple	27	6.5%
Male householder, no spouse	76	18.2%
Female householder, no spouse	102	24.4%
Households with children under 18	68	16.3%
Households with seniors (65+)	221	52.9%
Average household size	2.32

Marital status

Status	Male	Female
Never married	27.3%	6.3%
Married	55.9%	54.5%
Separated	0.0%	1.9%
Widowed	2.2%	13.4%
Divorced	14.6%	23.9%

Education

Less than 9th grade 5.6%

Some HS, no diploma 13.8%

HS graduate 16.6%

Some college, no degree 23.7%

Associate's degree 10.8%

Bachelor's degree 23.8%

Graduate / professional 5.7%

Metric	%
HS diploma or higher	80.6%
Bachelor's or higher	29.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	14	9.9%
Kindergarten	11	7.7%
Elementary school	56	39.4%
High school	33	23.2%
College / grad school	28	19.7%

Employment

Industry of employment

Education & healthcare 34.8%

Agriculture & mining 23.8%

Manufacturing 7.1%

Construction 6.5%

Retail trade 4.8%

Public administration 4.5%

Professional & management 4.2%

Finance & real estate 3.6%

Wholesale trade 3.0%

Transportation & utilities 3.0%

Information 2.4%

Other services 2.1%

Arts, food & hospitality 0.3%

Occupation

Category	%
Management, business & arts	56.0%
Service	10.7%
Sales & office	11.0%
Natural resources & construction	16.1%
Production & transportation	6.3%

Employment type

Type	%
Private sector	63.4%
Government	28.3%
Self-employed	8.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	65.8%
Carpool	11.2%
Public transit	0.0%
Walk	10.0%
Work from home	12.4%
Other means	0.6%
Avg commute (minutes)	23.9

Poverty

All people 10.5%

Under 18 years 9.5%

18 and over 10.7%

Married-couple families 3.8%

Female-led households 14.0%

Income support

Source	% of households
Social Security	47.8%
Retirement income	34.7%
Supplemental Security	7.2%
Cash public assistance	6.0%
Food stamps / SNAP	13.4%

Health indicators

Condition	%
Obesity	32.7%
High blood pressure	38.2%
High cholesterol	37.4%
Diabetes	11.3%
Heart disease	9.3%
Stroke	4.3%
Asthma	10.9%
Arthritis	32.0%
Kidney disease	4.0%
Pulmonary disease	8.9%
Cancer	9.5%

Behavior / access	%
Smoking	15.9%
Binge drinking	14.8%
No physical activity	21.7%
Less than 7 hrs sleep	27.6%
Depression	25.9%
Fair or poor health	16.7%
Poor mental health	14.3%
Poor physical health	12.9%
No health insurance	9.9%
Visited doctor (checkup)	73.3%
Visited dentist	67.7%
Cholesterol screening	90.5%
Teeth loss	13.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	85	10.6%

Disability	%
Any disability	25.9%
Under 18	0.0%
18–64 years	25.8%
65 and over	38.8%

Health insurance coverage

Type	%
Private insurance	68.4%
Public insurance	49.3%
No insurance	1.9%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	919	94.8%
Spanish	4	0.4%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	4	0.4%

Place of birth & citizenship

Origin	Count	%
Native born (US)	954	98.5%
Born in same state	943	97.3%
Born in different state	641	66.2%
Foreign born	11	1.1%
Naturalized citizen	15	1.5%
Not a US citizen	7	46.7%

Ancestry

Ancestry	Count	%
Italian	161	16.6%
French	104	10.7%
Polish	21	2.2%
Arab	21	2.2%

Ancestry	Count	%
English	5	0.5%
German	3	0.3%
Dutch	3	0.3%

Technology access

Metric	% of households
Computer access	43.1%
Internet access	80.9%

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

Frequently asked questions about ZIP code 99171

What city is ZIP code 99171 in?

ZIP code 99171 is primarily assigned to Saint John, Washington.

What county is ZIP code 99171 in?

ZIP code 99171 falls within Whitman County, Washington.

Does ZIP code 99171 have an older population?

33% of residents in ZIP code 99171 are 65 or older, above the national average of ~17%.

Does ZIP code 99171 have a large retiree population?

48% of households in ZIP code 99171 receive Social Security income, suggesting a significant retiree or disability population.

Does ZIP code 99171 have a large veteran population?

11% of civilians in ZIP code 99171 are veterans, above the national average of ~7%.

What is the population of ZIP code 99171?

ZIP code 99171 has an estimated population of 969 residents, with a density of 4 people per square mile.

What timezone is ZIP code 99171 in?

ZIP code 99171 observes the PST timezone.