99176 ZIP Code — Thornton, WA

Whitman County, Washington

ZIP code 99176 is located in Thornton, Washington, within Whitman County. It covers approximately 50.11 square miles and serves a population of 136 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 509.

136

population

50.11

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

99176 ZIP code map

Cities in ZIP code 99176

Below are the cities the US Postal Service accepts for ZIP code 99176. Using any city not on this list may result in mail delivery delays.

City	Status
Thornton	Acceptable

Demographics updated 05/2026

Population
Total population	136
Population density	3 / sq mi
State FIPS	53
County FIPS	075

Geography
Land area	50.11 sq mi
Water area	0.00 sq mi
Latitude	47.1078
Longitude	-117.3698
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	50.7%	55.9%	31.7%
$50k – $100k	38.0%	24.5%	30.6%
$100k – $200k	2.8%	15.6%	27.1%
Over $200k	8.5%	4.0%	10.6%

Demographics & statistics

136

Population

People per sq mi

58.6

Median age

$68,281

Median household income

$43,529

Per capita income

$241,700

Median home value

Median monthly rent

91.5%

Home ownership

0.0%

Poverty rate

0.0%

Unemployment

Housing units

12.2%

Bachelor's or higher

Age distribution

Male Female

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

← Male

Female →

Age summary

Group	Count	%
Under 18	8	5.9%
18 and over	128	94.1%
65 and over	36	26.5%
Median age	58.6 years

Race & ethnicity

White 100%

Group	Count	%
White	136	100%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	50.7%	55.9%	31.7%
$50k – $100k	38.0%	24.5%	30.6%
$100k – $200k	2.8%	15.6%	27.1%
Over $200k	8.5%	4.0%	10.6%

$15k–$25k 2.8%

$25k–$35k 25.4%

$35k–$50k 12.7%

$50k–$75k 16.9%

$75k–$100k 4.2%

$100k–$150k 21.1%

$150k–$200k 14.1%

$200k+ 2.8%

Range	% of households
$15k–$25k	2.8%
$25k–$35k	25.4%
$35k–$50k	12.7%
$50k–$75k	16.9%
$75k–$100k	4.2%
$100k–$150k	21.1%
$150k–$200k	14.1%
$200k+	2.8%
Median income	$68,281

Housing

Home values

$50k–$100k 23.1%

$150k–$200k 15.4%

$200k–$300k 29.2%

$300k–$500k 12.3%

$500k–$1M 20.0%

Housing overview

Metric	Value
Median home value	$241,700
Median rent / month	$0
Owner occupied	91.5%
Renter occupied	8.5%
Vacant	29.7%
Single-family detached	77.2%
Large apartment buildings	0.0%
Mobile homes	22.8%
Median rooms	7.2
Avg household size (owned)	1.92

Year built

Era	%
2020 or later	0.0%
2010–2019	9.9%
2000–2009	2.0%
1990–1999	0.0%
1980–1989	4.0%
1970–1979	10.9%
1960–1969	0.0%
1950–1959	5.9%
1940–1949	20.8%
1939 or earlier	46.5%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	9.9%
2 bedrooms	18.8%
3 bedrooms	52.5%
4 bedrooms	6.9%
5+ bedrooms	11.9%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	5.6%
2 vehicles	38.0%
3 or more	56.3%

Heating fuel

Fuel type	%
Electricity	67.6%
Fuel oil	11.3%
Wood	14.1%

Households & families

Household type	Count	%
Married-couple family	40	56.3%
Cohabiting couple	0	0.0%
Male householder, no spouse	9	12.7%
Female householder, no spouse	22	31.0%
Households with children under 18	2	2.8%
Households with seniors (65+)	28	39.4%
Average household size	1.92

Marital status

Status	Male	Female
Never married	31.9%	0.0%
Married	60.9%	62.7%
Separated	0.0%	0.0%
Widowed	7.2%	15.3%
Divorced	0.0%	22.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 0.0%

HS graduate 23.5%

Some college, no degree 21.7%

Associate's degree 42.6%

Bachelor's degree 9.6%

Graduate / professional 2.6%

Metric	%
HS diploma or higher	100.0%
Bachelor's or higher	12.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	2	11.1%
Elementary school	3	16.7%
High school	9	50.0%
College / grad school	4	22.2%

Employment

Industry of employment

Education & healthcare 30.5%

Arts, food & hospitality 23.2%

Agriculture & mining 20.7%

Construction 17.1%

Professional & management 6.1%

Manufacturing 1.2%

Wholesale trade 1.2%

Occupation

Category	%
Management, business & arts	34.1%
Service	24.4%
Sales & office	14.6%
Natural resources & construction	26.8%
Production & transportation	0.0%

Employment type

Type	%
Private sector	89.0%
Government	11.0%
Self-employed	0.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	86.6%
Carpool	0.0%
Public transit	0.0%
Walk	0.0%
Work from home	13.4%
Other means	0.0%
Avg commute (minutes)	34.2

Poverty

All people 0.0%

Under 18 years 0.0%

18 and over 0.0%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	36.6%
Retirement income	26.8%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	0.0%

Health indicators

Condition	%
Obesity	32.5%
High blood pressure	34.4%
High cholesterol	37.8%
Diabetes	9.7%
Heart disease	7.2%
Stroke	3.3%
Asthma	10.7%
Arthritis	28.3%
Kidney disease	3.2%
Pulmonary disease	7.3%
Cancer	8.2%

Behavior / access	%
Smoking	14.8%
Binge drinking	16.6%
No physical activity	17.9%
Less than 7 hrs sleep	27.5%
Depression	26.1%
Fair or poor health	13.5%
Poor mental health	14.1%
Poor physical health	11.2%
No health insurance	8.2%
Visited doctor (checkup)	71.8%
Visited dentist	71.9%
Cholesterol screening	91.2%
Teeth loss	10.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	6	4.7%

Disability	%
Any disability	11.0%
Under 18	0.0%
18–64 years	10.9%
65 and over	13.9%

Health insurance coverage

Type	%
Private insurance	77.2%
Public insurance	33.1%
No insurance	8.8%
Uninsured under 19	61.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	136	100.0%
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)	136	100.0%
Born in same state	136	100.0%
Born in different state	112	82.4%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	31	22.8%
Arab	28	20.6%

Ancestry	Count	%
French	11	8.1%
English	3	2.2%

Technology access

Metric	% of households
Computer access	52.2%
Internet access	97.2%

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

Frequently asked questions about ZIP code 99176

What city is ZIP code 99176 in?

ZIP code 99176 is primarily assigned to Thornton, Washington.

What county is ZIP code 99176 in?

ZIP code 99176 falls within Whitman County, Washington.

Is ZIP code 99176 mostly owner-occupied?

92% of occupied units in ZIP code 99176 are owner-occupied, well above the national average.

Does ZIP code 99176 have an older population?

27% of residents in ZIP code 99176 are 65 or older, above the national average of ~17%.

How educated is the population of ZIP code 99176?

12% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Does ZIP code 99176 have a large retiree population?

37% of households in ZIP code 99176 receive Social Security income, suggesting a significant retiree or disability population.

What timezone is ZIP code 99176 in?

ZIP code 99176 observes the PST timezone.