PlainZIP

Farmington, WA · standard

ZIP Code 99128

Whitman County, Washington - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

321
2/sq mi
$58,942
Median income
$363,500
Median home value
25.5%
Bachelor's or higher

The verdict

Farmington pairs a below-median household income with upper-quartile home values, in a rural, homeowner-dominated area.

27th pct
household income, US ZIPs
Top 25%
home value, US ZIPs
2
people per sq mi
76%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 99128 against every reporting US ZIP.

ZIP code 99128 is a sparsely populated ZIP (a standard USPS delivery area) in Farmington, Whitman County, Washington, home to just 321 residents across 214.0 square miles, a density of 2 people per square mile, in the Los Angeles time zone.

ZIP 99128 reports a modest median household income of $58,942 (35% below the Washington average), while per-capita income is $38,137. Local economic indicators show a 17.8% poverty rate alongside 13.1% unemployment. On housing, the median home value is $363,500 (29% below the state average) with median rent at $1,089 per month, and 76.0% of occupied units are owner-occupied.

Educational attainment sits below the national norm: 25.5% of adults hold a bachelor's degree or higher, the median age is 57.1, and the average commute is -. Beyond these figures, 2 nearby ZIP codes within about 10 miles are surfaced below, along with 6 more sharing Whitman County, letting you compare 99128 to its immediate surroundings rather than a national baseline alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 99128, Farmington, WA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

321

Population

214.0

Area (sq mi)

2

People / sq mi

Los Angeles

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 99128?

57.1

Median Age

56.4%

Male

43.6%

Female

1.2%

Foreign-Born

White 94.2%
African American 0.0%
Asian 0.8%
American Indian or Alaska Native 1.9%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 2.3%
Hispanic or Latino 6.9%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$58,942

Median Household Income

-35% vs state

$38,137

Per Capita Income

17.8%

Poverty Rate

13.1%

Unemployment Rate

How ZIP 99128 ranks nationally

Farmington, WA household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$58,942 27th percentile higher than 27% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). This entry sits in this band. $60,000–$80,000: 9,980 US ZIPs (33%). Above this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 67.5%
Bachelor's Degree or Higher 25.5%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

158

Total Housing Units

125

Occupied Units

33

Vacant Units

2.07

Avg Household Size

Occupancy Type

Owner 76.0%
Renter 24.0%

$363,500

Median Home Value

-29% vs state

$1,089

Median Rent

1938

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 5 business establishments in ZIP 99128, employing approximately 18 people with a combined annual payroll of $797,000.

5

Businesses

18

Employees

$797K

Annual Payroll

0

Industry Sectors

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 99128 vs 99033 →

ZIP 99128 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 99128 ranks #3 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 99128 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 99128 ranks #2 of 3 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
99033 Tekoa, WA 895 9.3 mi
99130 Garfield, WA 828 8.8 mi

More ZIP Codes in Whitman County

99163 standard
Pullman, WA
Pop: 31,404
99111 standard
Colfax, WA
Pop: 4,047
99161 standard
Palouse, WA
Pop: 1,400
99170 standard
Rosalia, WA
Pop: 1,072
99171 standard
Saint John, WA
Pop: 959
99033 standard
Tekoa, WA
Pop: 895

Related Areas

Whitman County Farmington, WA Washington

Frequently Asked Questions

What county is ZIP code 99128 in? ▼
ZIP code 99128 (Farmington) is located in Whitman County, Washington. Whitman County contains multiple ZIP codes, see the full list at /counties/whitman-wa.
What is the population of ZIP code 99128? ▼
ZIP code 99128 in Farmington, WA has a population of 321 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 99128? ▼
The median household income in ZIP 99128 is $58,942, which is 23% below the national average of $76,288.
What is the average home value in ZIP 99128? ▼
The median home value in ZIP 99128 is $363,500, which is 31% above the national average of $278,155.
What is the demographic makeup of ZIP 99128? ▼
The largest racial group in ZIP 99128 is White at 94.2%. Hispanic or Latino residents make up 6.9% of the population.
How many businesses are in ZIP code 99128? ▼
ZIP code 99128 has 5 business establishments employing approximately 18 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 99128? ▼
In ZIP code 99128, 67.5% of residents aged 25+ have a high school diploma or higher, and 25.5% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 99128? ▼
In ZIP code 99128, approximately 76.0% of occupied housing units are owner-occupied and 24.0% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 99128? ▼
The poverty rate in ZIP code 99128 is 17.8% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.