🇺🇸 United States ZIP Code

STANDARD

99338

Kennewick

ZIP Code 99338 is a standard zip code serving Kennewick, Kennewick, Washington (WA), in Benton County, United States. It has an estimated population of 11,555 with a median household income of $99,750. The area falls within the America/Los_Angeles timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Washington (WA)
County: Benton
City: Kennewick
Timezone: America/Los_Angeles

Coordinates

Latitude: 46.156000
Longitude: -119.264000

Geographic Details

Land Area: 66.38 mi²
Population Density: 174.0 people per mi² (60th percentile)
Bounding Box: 46.242488°N, 46.058368°S, -119.159365°E, -119.358996°W

With 11,555 residents spread across 66.38 square miles, this area has a population density of 174.0 people per square mile.

Demographics

11,555

Population

70th percentile

$99,750

Median Income

95th percentile

$264,300

Median Home Value

80th percentile

66.38 mi²

Land Area

The median household income in 99338 is $99,750, and the median home value is $264,300. This places the area in the top 25% nationally for household income.

Housing

4,095

Total Units

3,985

Occupied Units

97.3%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Kennewick, WA.

99336

Kennewick

99337

Kennewick

Similar ZIP Codes in Washington

ZIP codes with similar median household income in Washington.

98004

Bellevue

$93,521

98014

Carnation

$95,394

98072

Woodinville

$107,654

99036

Valleyford

$89,306

98024

Fall City

$93,777

98177

Seattle

$95,648

99019

Liberty Lake

$85,821

98059

Renton

$91,465

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.