Zip Code 99403
Clarkston, Washington — Asotin County
📍 ZIP code 99403 is in Clarkston, Asotin County, Washington.
ZIP code 99403 is located in Clarkston, Asotin County, Washington. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 20,483. The area code for ZIP code 99403 is 509.
Quick Answer
Zip code 99403 is in Clarkston, Washington (Asotin County). It has a population of 20,483, median household income of $67,424, and median home value of $283,800.
Population
20,483
Income
$67,424
Home Value
$283,800
Climate
91°F / 30°F
About Zip Code 99403
Zip code 99403 is located in Clarkston, Washington, within Asotin County. Home to approximately 20,483 residents, this area sits at an elevation of 2136 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 509.
The median household income is $67,424 per year, which is below the national median of $70,784. Homes in this zip code have a median value of $283,800, and the cost of living index is 89 (11% below the national average of 100).
Summers average a high of 91°F while winters drop to 30°F. The area receives about 13 in of rain and 13 in of snow annually. The zip code covers 152.8 square miles of land area and 1.4 square miles of water.
Key Statistics
20,483
$67,424
$283,800
Pacific (PST/PDT)
509
2136 ft
152.8 sq mi
45.5
9,192
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Compare With Nearby Zip Codes
| Metric | 99403 | 99179 | 99402 | 99347 | 99113 | 99401 |
|---|---|---|---|---|---|---|
| City | Clarkston, WA | Uniontown, WA | Asotin, WA | Pomeroy, WA | Colton, WA | Anatone, WA |
| Population | 20,483 | 647 | 1,628 | 2,467 | 535 | 349 |
| Median Income | $67,424 | $76,797 | $80,428 | $61,741 | $95,357 | $62,250 |
| Home Value | $283,800 | $323,900 | $295,700 | $220,800 | $355,700 | $322,100 |
| Cost of Living | 89 | 108 | 112 | 74 | 108 | 105 |
| Median Age | 45.5 | 31.3 | 48.9 | 52.3 | 57.2 | 36.5 |
Cost of Living
100 = National Average. Clarkston's cost of living is 11% below the national average.
vs. State Avg
Below
Affordability
Affordable
Income-to-Home
4.2x
Demographics
Zip code 99403 has a population of 20,483 people with a median age of 45.5. There are 9,192 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Clarkston (99403) population trend from 2010 to 2024
↑ 35.4%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
91°F
30°F
13 in
13 in
Clarkston experiences hot summers with average highs around 91°F. Winters are cool with lows averaging 30°F. The area receives about 13 in of snow per year.
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Housing & Economy
Median Home Value
$283,800
Median Household Income
$67,424
With 9,192 housing units across 152.8 square miles, 99403 has a housing density of 60 units per square mile. The home price-to-income ratio is 4.2x.
Location & Geography
Latitude
46.3624°
Longitude
-117.2826°
Land Area
152.8 sq mi
Water Area
1.4 sq mi
Nearby Zip Codes
Zip codes closest to 99403 (Clarkston, WA) with distances:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 99403's $67,424. A way to compare Clarkston to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 99403 (Clarkston, WA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Clarkston, Washington?
Clarkston, Washington uses zip code 99403.
What county is zip code 99403 in?
Zip code 99403 is located in Asotin County, Washington.
What is the population of zip code 99403?
The population of zip code 99403 is 20,483 with a median age of 45.5.
Is 99403 in Clarkston, Washington?
Yes, zip code 99403 is in Clarkston, Asotin County, Washington. The area code is 509.
Frequently Asked Questions
What city is zip code 99403 in?
Zip code 99403 is in Clarkston, Washington. It is part of Asotin County and uses the Pacific (PST/PDT) timezone.
What is zip code 99403?
Zip code 99403 is a U.S. postal code in Clarkston, Washington (Asotin County). It has a population of 20,483 and covers 152.8 square miles.
What is the population of zip code 99403?
The population of zip code 99403 (Clarkston, WA) is 20,483 with a median age of 45.5. There are approximately 9,192 housing units in this area.
What is the median income in zip code 99403?
The median household income in zip code 99403 (Clarkston, WA) is $67,424 per year. The cost of living index is 89 (100 = national average).
What is the average home price in zip code 99403?
The median home value in zip code 99403 (Clarkston, WA) is $283,800. The cost of living index is 89 compared to the national average of 100.
What county is zip code 99403 in?
Zip code 99403 is located in Asotin County, Washington. The primary city is Clarkston.
What is the area code for zip code 99403?
Zip code 99403 in Clarkston, WA uses area code 509. It is located in the Pacific (PST/PDT) timezone.
Is zip code 99403 a good place to live?
Zip code 99403 (Clarkston, WA) has a cost of living index of 89 (100 = national average), a median household income of $67,424, and median home values of $283,800. The median age is 45.5. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 99403?
The cost of living index for zip code 99403 (Clarkston, WA) is 89, where 100 represents the national average. This area is below the national average. Median home value: $283,800.
What schools serve zip code 99403?
Zip code 99403 in Clarkston, Washington is served by the local school district of Asotin County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.