Residential delivery area · Washington
ZIP Code 99403: Clarkston, WA
ZIP code 99403 uses the postal name Clarkston, Washington and lies mostly in Asotin County (80% of its land) with the rest in Garfield County (Census 2020 ZIP-county file). About 21,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $71,482 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Clarkston Heights-Vineland (8%), West Clarkston-Highland (2%) and Clarkston (1%); 89% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Clarkston · its only residential ZIP
- County
- Asotin County (80%); Garfield County (20%)
- Census places
- Clarkston Heights-Vineland (8%) census-designated place; West Clarkston-Highland (2%) census-designated place; Clarkston (1%)
- Metro area
- Lewiston, ID-WA
- House district
- WA-5 119th Congress
- State
- Washington
- Time zone
- Pacific
- Land area
- 143.5 sq mi · 145 people per sq mi
Where is ZIP code 99403?
99403 centers on 46.376°, -117.290° and covers 143.5 square miles of land plus 1.4 of water. It borders 4 ZIP codes: 99402, 99179, 99347, 83501.
The map draws ZIP code areas only. For the streets inside 99403, 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 99403 compare with the rest of Asotin County?
| Measure | 99403 | In Asotin County | In WA |
|---|---|---|---|
| People (ACS 2020-2024) | 20,760 | 1st of 3 | 175th of 605 |
| Median household income | $72k | 2nd of 2 | 291st of 363 |
| Median home value | $325k | 1st of 1 | 336th of 392 |
Its median household income is higher than in 49% of U.S. residential ZIP codes, and it is denser than 59% 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 99403?
The 2020 Census counted 20,224 people in 99403; the ACS, which samples households over 2020-2024, estimates 20,760. Between the 2010 and 2020 censuses its population grew 3.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 20,760
- 2020 Census count
- 20,224+3.5% since 2010 (19,548)
- Households
- 8,743
- Median age
- 45.7
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 99403?
Of the 20,760 people the ACS estimates in 99403, 19.4% are under 18 and 24.7% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (86.8%).
- Under 1819.4%
- 18 to 6456.0%
- 65 and older24.7%
- White, not Hispanic86.8%
- Other or two or more6.5%
- Hispanic or Latino4.5%
- Asian, not Hispanic1.2%
- Black, not Hispanic0.9%
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 99403 earn?
Median household income is $71,482 (ACS 2020-2024). It is not measurably different from 2015-2019 ($65,127 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $71,482
- Income per person
- $39,953
- Below the poverty line
- 14.8%
- Unemployed (of the labor force)
- 5.2%
- Adults 25+ with a bachelor's degree
- 25.0%
- Adjusted gross income per tax return, 2022
- $75,0939,040 returns; wages 56% 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 99403?
FHFA's house price index for 99403, built from repeat sales and appraisals of the same homes, rose 96% from 2015 to 2025 and rose 53% from 2020 to 2025, and moved +4.9% in 2025.
- Median home value (owners' estimate)
- $325,300
- Median gross rent
- $1,036
- Homes owned by their occupants
- 72.2%
- Housing units
- 9,281
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 99403?
413 business establishments had a location in this ZIP code in 2023, 7 more than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance66
- Construction53
- Retail trade42
- Other services (except public administration)42
- Accommodation and food services40
- Professional, scientific, and technical services31
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 99403?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 99402 | Asotin | 1,557 | $79k | 11.1 mi |
| 99179 | Uniontown | 645 | $79k | 11.4 mi |
| 99347 | Pomeroy | 2,512 | $65k | 13.9 mi |
| 83501 | Lewiston, ID | 37,520 | $74k | 19.4 mi |
| 99113 | Colton | 560 | $105k | 15.1 mi (near) |
| 99401 | Anatone | 163 | $41k | 20.0 mi (near) |
| 83832 | Genesee, ID | 1,961 | $91k | 21.9 mi (near) |
| 83540 | Lapwai, ID | 2,096 | $63k | 24.3 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.