Residential delivery area · Washington
ZIP Code 99111: Colfax, WA
ZIP code 99111 uses the postal name Colfax, Washington and lies entirely in Whitman County (Census 2020 ZIP-county file). About 4,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $73,393 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Colfax (1%) and Steptoe (under 1%); 98% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Colfax · its only residential ZIP
- County
- Whitman County
- Census places
- Colfax (1%); Steptoe (under 1%) census-designated place
- Micro area
- Pullman, WA
- House district
- WA-5 119th Congress
- State
- Washington
- Time zone
- Pacific
- Land area
- 307.0 sq mi · 13 people per sq mi
Where is ZIP code 99111?
99111 centers on 46.856°, -117.451° and covers 307.0 square miles of land plus 0.1 of water. It borders 10 ZIP codes: 99174, 99163, 99161, 99125, 99130, 99176, 99171, 99143, 99158, 99347.
The map draws ZIP code areas only. For the streets inside 99111, 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 99111 compare with the rest of Whitman County?
| Measure | 99111 | In Whitman County | In WA |
|---|---|---|---|
| People (ACS 2020-2024) | 4,038 | 3rd of 22 | 315th of 605 |
| Median household income | $73k | 2nd of 5 | 279th of 363 |
| Median home value | $296k | 4th of 5 | 348th of 392 |
Its median household income is higher than in 52% of U.S. residential ZIP codes, and it is denser than 20% of all 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 99111?
The 2020 Census counted 4,029 people in 99111; the ACS, which samples households over 2020-2024, estimates 4,038. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 4,038
- 2020 Census count
- 4,029
- Households
- 1,714
- Median age
- 41.8
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 99111?
Of the 4,038 people the ACS estimates in 99111, 23.5% are under 18 and 19.7% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (80.6%), then Hispanic or Latino (10.7%).
- Under 1823.5%
- 18 to 6456.8%
- 65 and older19.7%
- White, not Hispanic80.6%
- Hispanic or Latino10.7%
- Other or two or more6.1%
- Black, not Hispanic1.7%
- Asian, not Hispanic0.8%
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 99111 earn?
Median household income is $73,393 (ACS 2020-2024), the 2nd highest of the 5 ranked ZIP codes in Whitman County.
- Median household income
- $73,393±$14,782
- Income per person
- $37,809
- Below the poverty line
- 10.1%
- Unemployed (of the labor force)
- 2.7%
- Adults 25+ with a bachelor's degree
- 30.5%
- Adjusted gross income per tax return, 2022
- $79,3411,900 returns; wages 63% 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 99111?
FHFA's house price index for 99111, built from repeat sales and appraisals of the same homes, rose 117% from 2015 to 2025 and rose 52% from 2020 to 2025, and moved +12.3% in 2025.
- Median home value (owners' estimate)
- $295,800
- Median gross rent
- $953
- Homes owned by their occupants
- 72.9%
- Housing units
- 1,932
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 99111?
134 business establishments had a location in this ZIP code in 2023, 3 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction21
- Retail trade17
- Other services (except public administration)15
- Health care and social assistance14
- Wholesale trade12
- Finance and insurance10
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 99111?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 99174 | Steptoe | 69 | $50k | 11.4 mi |
| 99163 | Pullman | 34,022 | $48k | 14.0 mi |
| 99161 | Palouse | 1,435 | $88k | 14.7 mi |
| 99125 | Endicott | 611 | $53k | 15.8 mi |
| 99130 | Garfield | 693 | $82k | 16.0 mi |
| 99176 | Thornton | 163 | $128k | 16.4 mi |
| 99171 | Saint John | 895 | $53k | 19.3 mi |
| 99143 | Lacrosse | 585 | $38k | 19.8 mi |
| 99158 | Oakesdale | 561 | $78k | 21.6 mi |
| 99347 | Pomeroy | 2,512 | $65k | 30.5 mi |
| 99102 | Albion | 495 | $57k | 10.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.