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ZIP CODE TABULATION AREA

99128

Washington · 259 residents · 59.494 sq mi
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ZIP 99128 has notably lower household income than the US average, with a median household income of $58,942. Population has held roughly steady since 2024. Median home value is $363,500. With a median age of 57.1, the population is older than the US median of 38.9. Among the 20 ZIP codes in Whitman County, 99128 ranks 11th by median household income.

$58,942
US average: $82,259
$363,500
US average: $376,019
25.5%
US average: 35.6%
Age, sex & households
Under 18
18.1%
Age 65+
29.7%
56.4%
43.6%
2.07 people
Race & ethnicity · 2024
2024
White, non-Hispanic88.8%(230)
Black0%(0)
Hispanic / Latino6.9%(18)
Asian0.8%(2)
Other3.5%(9)
Diversity Score25.7%(66)
Housing
Commute & vehicles
Work & employment
People & community
Affordability & inequality
Within Whitman County
Income rank vs other ZIPs
LOWEST11TH OF 20HIGHEST
Adjacent ZIPs
99017$58,958
99033$58,750
99102$56,833
99111$73,393
Frequently asked

How many people live in ZIP code 99128?

ZIP code 99128 has about 259 residents according to the 2024 American Community Survey.

What is the median household income in ZIP code 99128?

The typical household in ZIP code 99128 earns about $58,942 a year. Half of households make more than that, and half make less.

Is ZIP code 99128 expensive?

In ZIP code 99128, the median home is worth about $363,500, and the typical rent is about $1,089 a month.

How educated are people in ZIP code 99128?

About 25.5% of adults age 25 and over in ZIP code 99128 hold a bachelor's degree or higher.

What is the poverty rate in ZIP code 99128?

About 17.8% of people in ZIP code 99128 live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR · ZCTA · UPDATED 2024