99170 ZIP Code — Rosalia, WA

Whitman County, Washington

ZIP code 99170 is located in Rosalia, Washington, within Whitman County. It covers approximately 173.10 square miles and serves a population of 955 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 509.

About ZIP code 99170

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 $179,300. Owner-occupancy is high at 81%, well above the national average.

Median household income is $61,250. 32% 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 34 minutes is near the national average.

Educational attainment is near the national average, with 23% of residents holding a bachelor's degree or higher.

Overall, ZIP code 99170 reflects a community defined by high homeownership and a significant Social Security-dependent population.

955
population
173.10
sq mi land
Standard
ZIP type
Pacific (PT)
timezone
99170 ZIP code map
Cities in ZIP code 99170

Below are the cities the US Postal Service accepts for ZIP code 99170. Using any city not on this list may result in mail delivery delays.

City Status
Rosalia Acceptable
Rosalia Preferred
Nearby ZIP codes
99018 Latah (10.8 mi) 99033 Tekoa (11.6 mi) 99158 Oakesdale (12.3 mi) 99031 Spangle (12.5 mi) 99012 Fairfield (13.7 mi) 99171 Saint John (15.8 mi) 99004 Cheney (15.9 mi) 99104 Belmont (16.3 mi) 99128 Farmington (17.6 mi) 99017 Lamont (19.2 mi) 99036 Valleyford (19.4 mi)
Demographics updated 05/2026
Population
Total population 955
Population density 6 / sq mi
State FIPS 53
County FIPS 075
Geography
Land area 173.10 sq mi
Water area 0.32 sq mi
Latitude 47.2583
Longitude -117.4013
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 45.3% 55.9% 31.7%
$50k – $100k 26.1% 24.5% 30.6%
$100k – $200k 27.9% 15.6% 27.1%
Over $200k 0.7% 4.0% 10.6%

Demographics & statistics

955
Population
6
People per sq mi
45.8
Median age
$61,250
Median household income
$33,548
Per capita income
$179,300
Median home value
$906
Median monthly rent
80.8%
Home ownership
11.9%
Poverty rate
6.0%
Unemployment
392
Housing units
23.3%
Bachelor's or higher

Age distribution

Male Female
41
Under 5
40
20
5–9
20
36
10–14
34
32
15–19
31
23
20–24
22
46
25–34
44
34
35–44
32
71
45–54
69
33
55–59
32
49
60–64
47
59
65–74
56
28
75–84
28
14
85+
14
← Male
Female →

Age summary

GroupCount%
Under 1824225.3%
18 and over71374.7%
65 and over19920.8%
Median age45.8 years

Race & ethnicity

White 84.9%
Two or more races 10%
Hispanic or Latino 2.5%
Other race 1.4%
Asian 0.6%
American Indian / Alaska Native 0.3%
Native Hawaiian / Pacific Islander 0.3%
GroupCount%
White83184.9%
Two or more races9810%
Hispanic or Latino242.5%
Other race141.4%
Asian60.6%
American Indian / Alaska Native30.3%
Native Hawaiian / Pacific Islander30.3%

Household income

Income range This ZIP County avg State avg
Under $50k 45.3% 55.9% 31.7%
$50k – $100k 26.1% 24.5% 30.6%
$100k – $200k 27.9% 15.6% 27.1%
Over $200k 0.7% 4.0% 10.6%
Under $10k 4.7%
$10k–$15k 3.2%
$15k–$25k 15.5%
$25k–$35k 7.6%
$35k–$50k 8.9%
$50k–$75k 16.1%
$75k–$100k 8.9%
$100k–$150k 21.1%
$150k–$200k 7.1%
$200k+ 6.8%
Range% of households
Under $10k4.7%
$10k–$15k3.2%
$15k–$25k15.5%
$25k–$35k7.6%
$35k–$50k8.9%
$50k–$75k16.1%
$75k–$100k8.9%
$100k–$150k21.1%
$150k–$200k7.1%
$200k+6.8%
Median income$61,250

Housing

Home values

Under $50k 2.6%
$50k–$100k 18.2%
$100k–$150k 18.2%
$150k–$200k 21.2%
$200k–$300k 16.6%
$300k–$500k 22.1%
$500k–$1M 1.0%

Housing overview

MetricValue
Median home value$179,300
Median rent / month$906
Owner occupied80.8%
Renter occupied19.2%
Vacant18.3%
Single-family detached87.1%
Large apartment buildings0.0%
Mobile homes8.6%
Median rooms6.7
Avg household size (owned)2.56

Year built

Era%
2020 or later0.0%
2010–20190.4%
2000–20092.8%
1990–19995.2%
1980–19897.1%
1970–19799.5%
1960–19693.9%
1950–195912.0%
1940–19498.4%
1939 or earlier50.8%

Bedrooms

Size% of units
No bedroom (studio)0.0%
1 bedroom3.0%
2 bedrooms27.1%
3 bedrooms43.9%
4 bedrooms19.6%
5+ bedrooms6.5%

Vehicles per household

Vehicles% of households
No vehicle5.3%
1 vehicle12.9%
2 vehicles41.1%
3 or more40.8%

Heating fuel

Fuel type%
Utility gas38.9%
Electricity38.2%
Propane / LP gas3.9%
Fuel oil6.6%
Wood8.4%

Households & families

Household typeCount%
Married-couple family21757.1%
Cohabiting couple318.2%
Male householder, no spouse6216.3%
Female householder, no spouse7018.4%
Households with children under 189224.2%
Households with seniors (65+)12733.4%
Average household size2.51

Marital status

StatusMaleFemale
Never married26.2%19.0%
Married61.4%60.3%
Separated3.6%0.5%
Widowed0.8%9.5%
Divorced8.0%10.6%

Education

Less than 9th grade 1.7%
Some HS, no diploma 2.0%
HS graduate 33.4%
Some college, no degree 23.9%
Associate's degree 15.7%
Bachelor's degree 14.3%
Graduate / professional 9.0%
Metric%
HS diploma or higher96.3%
Bachelor's or higher23.3%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool2411.2%
Kindergarten62.8%
Elementary school9544.2%
High school5726.5%
College / grad school3315.3%

Employment

Industry of employment

Education & healthcare 29.2%
Agriculture & mining 15.3%
Retail trade 10.5%
Manufacturing 10.0%
Transportation & utilities 5.5%
Public administration 5.5%
Wholesale trade 4.3%
Other services 4.3%
Construction 3.9%
Finance & real estate 3.4%
Professional & management 3.2%
Information 2.5%
Arts, food & hospitality 2.5%

Occupation

Category%
Management, business & arts42.4%
Service15.9%
Sales & office20.3%
Natural resources & construction10.3%
Production & transportation11.2%

Employment type

Type%
Private sector64.2%
Government19.4%
Self-employed16.4%
Unpaid family workers0.0%

Commute

Method%
Drive alone79.0%
Carpool2.8%
Public transit0.0%
Walk6.8%
Work from home10.0%
Other means1.4%
Avg commute (minutes)34.0

Poverty

All people 11.9%
Under 18 years 6.6%
18 and over 13.7%
Married-couple families 16.6%
Female-led households 37.5%

Income support

Source% of households
Social Security31.8%
Retirement income20.3%
Supplemental Security2.9%
Cash public assistance3.2%
Food stamps / SNAP12.6%

Health indicators

Condition%
Obesity34.1%
High blood pressure34.8%
High cholesterol35.3%
Diabetes10.4%
Heart disease7.7%
Stroke3.6%
Asthma11.2%
Arthritis29.3%
Kidney disease3.4%
Pulmonary disease8.1%
Cancer7.9%
Behavior / access%
Smoking16.9%
Binge drinking16.1%
No physical activity20.5%
Less than 7 hrs sleep29.2%
Depression26.9%
Fair or poor health15.6%
Poor mental health15.2%
Poor physical health12.3%
No health insurance9.9%
Visited doctor (checkup)71.5%
Visited dentist67.4%
Cholesterol screening89.4%
Teeth loss12.3%

Veterans & disability

VeteransCount%
Civilian veterans618.6%
Disability%
Any disability14.3%
Under 185.4%
18–64 years12.8%
65 and over29.1%

Health insurance coverage

Type%
Private insurance57.7%
Public insurance44.4%
No insurance7.3%
Uninsured under 195.2%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only87491.5%
Spanish10.1%
Other Indo-European10.1%
Asian & Pacific Islander00.0%
Other languages00.0%

Place of birth & citizenship

OriginCount%
Native born (US)93898.2%
Born in same state93397.7%
Born in different state64167.1%
Foreign born50.5%
Naturalized citizen171.8%
Not a US citizen17100.0%

Ancestry

AncestryCount%
Italian23624.7%
French14615.3%
Polish404.2%
AncestryCount%
Arab212.2%
English10.1%

Technology access

Metric% of households
Computer access39.8%
Internet access93.4%

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

Frequently asked questions about ZIP code 99170

What city is ZIP code 99170 in?

ZIP code 99170 is primarily assigned to Rosalia, Washington.

What county is ZIP code 99170 in?

ZIP code 99170 falls within Whitman County, Washington.

Is ZIP code 99170 mostly owner-occupied?

81% of occupied units in ZIP code 99170 are owner-occupied, well above the national average.

What is the typical home value in ZIP code 99170?

The median home value in ZIP code 99170 is $179,300.

What is the population of ZIP code 99170?

ZIP code 99170 has an estimated population of 955 residents, with a density of 6 people per square mile.

What is the median household income in ZIP code 99170?

The median household income in ZIP code 99170 is $61,250, below the national median of ~$75,000.

What timezone is ZIP code 99170 in?

ZIP code 99170 observes the PST timezone.

Need the complete ZIP code database? Download all 42,000+ US ZIP codes — Excel, CSV, or Access. Includes lat/lng, county FIPS & timezone.
Download database →