Residential delivery area · Washington
ZIP Code 99171: Saint John, WA
ZIP code 99171 uses the postal name Saint John, Washington and lies entirely in Whitman County (Census 2020 ZIP-county file). About 900 people live there (Census Bureau, ACS 2020-2024). Median household income is $53,333 (Census Bureau, ACS 2020-2024). By Census place, under 1% of its land lies in St. John; more than 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Saint John · its only residential ZIP
- County
- Whitman County
- Census places
- St. John
- Micro area
- Pullman, WA
- House district
- WA-5 119th Congress
- State
- Washington
- Time zone
- Pacific
- Land area
- 250.3 sq mi · 4 people per sq mi
Where is ZIP code 99171?
99171 centers on 47.098°, -117.654° and covers 250.3 square miles of land plus 3.7 of water. It borders 6 ZIP codes: 99125, 99176, 99017, 99170, 99111, 99004.
The map draws ZIP code areas only. For the streets inside 99171, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 99171 compare with the rest of Whitman County?
| Measure | 99171 | In Whitman County | In WA |
|---|---|---|---|
| People (ACS 2020-2024) | 895 | 7th of 22 | 437th of 605 |
| Median household income | $53k | not ranked | not ranked |
| Median home value | $221k | not ranked | not ranked |
99171's income and home value are not ranked: it has fewer than 1,000 residents (895). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 9% of U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 99171?
The 2020 Census counted 975 people in 99171; the ACS, which samples households over 2020-2024, estimates 895. Between the 2010 and 2020 censuses its population grew 1.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 895±190 (90% margin)
- 2020 Census count
- 975+1.7% since 2010 (959)
- Households
- 408
- Median age
- 55.7
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 99171?
Of the 895 people the ACS estimates in 99171, 13.2% are under 18 and 34.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (91.6%).
- Under 1813.2%
- 18 to 6452.4%
- 65 and older34.4%
- White, not Hispanic91.6%
- Other or two or more3.1%
- Asian, not Hispanic3.0%
- Hispanic or Latino1.9%
- Black, not Hispanic0.3%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 99171 earn?
Median household income is $53,333 (ACS 2020-2024). It fell from $68,747 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $53,333±$12,852
- Income per person
- $32,685
- Below the poverty line
- 13.1%
- Unemployed (of the labor force)
- 5.3%
- Adults 25+ with a bachelor's degree
- 25.4%
- Adjusted gross income per tax return, 2022
- $67,970500 returns; wages 62% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 99171?
FHFA's house price index for 99171, built from repeat sales and appraisals of the same homes, rose 47% from 2020 to 2025, and moved −6.2% in 2025.
- Median home value (owners' estimate)
- $220,500
- Median gross rent
- $929
- Homes owned by their occupants
- 77.5%
- Housing units
- 452
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 99171?
28 business establishments had a location in this ZIP code in 2023, 2 fewer than in 2018; the most are in wholesale trade (ZIP Code Business Patterns).
- Wholesale trade10
- Retail trade3
- Finance and insurance3
- Other services (except public administration)3
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 99171?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 99125 | Endicott | 611 | $53k | 10.4 mi |
| 99176 | Thornton | 163 | $128k | 11.4 mi |
| 99017 | Lamont | 230 | $59k | 12.4 mi |
| 99170 | Rosalia | 926 | $59k | 16.1 mi |
| 99111 | Colfax | 4,038 | $73k | 19.3 mi |
| 99004 | Cheney | 22,871 | $67k | 22.3 mi |
| 99149 | Malden | 100 | $26k | 12.4 mi (near) |
| 99174 | Steptoe | 69 | $50k | 15.3 mi (near) |
| 99158 | Oakesdale | 561 | $78k | 19.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.