99338 ZIP Code — Kennewick, WA
Benton County, Washington
ZIP code 99338 is located in Kennewick, Washington, within Benton County. It covers approximately 35.45 square miles and serves a population of 18,312 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 509.
About ZIP code 99338
The housing stock consists of predominantly single-family detached homes. Much of the housing stock is relatively new, reflecting recent development activity. Median home value is $457,300. Owner-occupancy is high at 85%, well above the national average.
The gap between median ($120,020) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 7% is below the national average.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 22 minutes is near the national average.
Educational attainment is near the national average, with 41% of residents holding a bachelor's degree or higher.
18,312
population
35.45
sq mi land
Standard
ZIP type
Pacific (PT)
timezone
99338 ZIP code map
Cities in ZIP code 99338
Below are the cities the US Postal Service accepts for ZIP code 99338. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Kennewick | Preferred |
Nearby ZIP codes
99352 Richland (12 mi)
99352 Richland (12 mi)
97882 Umatilla (12.5 mi)
97882 Umatilla (12.5 mi)
99336 Kennewick (13.4 mi)
99336 Kennewick (13.4 mi)
99337 Kennewick (13.4 mi)
99337 Kennewick (13.4 mi)
99353 West Richland (16.2 mi)
99353 West Richland (16.2 mi)
99320 Benton City (16.6 mi)
99320 Benton City (16.6 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 18,312 |
| Population density | 517 / sq mi |
| State FIPS | 53 |
| County FIPS | 005 |
| Geography | |
|---|---|
| Land area | 35.45 sq mi |
| Water area | 0.00 sq mi |
| Latitude | 46.0829 |
| Longitude | -119.3758 |
| Timezone | Pacific (PT) |
| Area code | 509 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 18.4% | 32.9% | 31.7% |
| $50k – $100k | 23.4% | 33.1% | 30.6% |
| $100k – $200k | 37.5% | 26.4% | 27.1% |
| Over $200k | 20.7% | 7.6% | 10.6% |
Demographics & statistics
18,312
Population
517
People per sq mi
38.7
Median age
$120,020
Median household income
$51,961
Per capita income
$457,300
Median home value
$1,370
Median monthly rent
85.4%
Home ownership
6.8%
Poverty rate
2.6%
Unemployment
5,650
Housing units
41.1%
Bachelor's or higher
Age distribution
Male
Female
544
Under 5
498
816
5–9
748
761
10–14
697
936
15–19
858
434
20–24
397
757
25–34
694
1,486
35–44
1,361
1,198
45–54
1,097
447
55–59
409
650
60–64
596
982
65–74
899
432
75–84
396
114
85+
105
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 5,411 | 29.5% |
| 18 and over | 12,901 | 70.5% |
| 65 and over | 2,928 | 16.0% |
| Median age | 38.7 years | |
Race & ethnicity
White
72.4%
Hispanic or Latino
9.8%
Two or more races
8.1%
Other race
5.4%
Asian
2.6%
Black or African American
1.5%
American Indian / Alaska Native
0.2%
| Group | Count | % |
|---|---|---|
| White | 14,693 | 72.4% |
| Hispanic or Latino | 1,993 | 9.8% |
| Two or more races | 1,647 | 8.1% |
| Other race | 1,097 | 5.4% |
| Asian | 518 | 2.6% |
| Black or African American | 307 | 1.5% |
| American Indian / Alaska Native | 50 | 0.2% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 18.4% | 32.9% | 31.7% |
| $50k – $100k | 23.4% | 33.1% | 30.6% |
| $100k – $200k | 37.5% | 26.4% | 27.1% |
| Over $200k | 20.7% | 7.6% | 10.6% |
Under $10k
1.8%
$10k–$15k
1.0%
$15k–$25k
1.0%
$25k–$35k
3.8%
$35k–$50k
11.1%
$50k–$75k
9.8%
$75k–$100k
14.5%
$100k–$150k
17.8%
$150k–$200k
14.4%
$200k+
24.9%
| Range | % of households |
|---|---|
| Under $10k | 1.8% |
| $10k–$15k | 1.0% |
| $15k–$25k | 1.0% |
| $25k–$35k | 3.8% |
| $35k–$50k | 11.1% |
| $50k–$75k | 9.8% |
| $75k–$100k | 14.5% |
| $100k–$150k | 17.8% |
| $150k–$200k | 14.4% |
| $200k+ | 24.9% |
| Median income | $120,020 |
Housing
Home values
Under $50k
2.0%
$50k–$100k
0.4%
$100k–$150k
1.8%
$150k–$200k
1.3%
$200k–$300k
9.6%
$300k–$500k
44.8%
$500k–$1M
35.5%
$1M+
4.5%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $457,300 |
| Median rent / month | $1,370 |
| Owner occupied | 85.4% |
| Renter occupied | 14.6% |
| Vacant | 4.8% |
| Single-family detached | 82.7% |
| Large apartment buildings | 7.2% |
| Mobile homes | 4.3% |
| Median rooms | 6.7 |
| Avg household size (owned) | 3.05 |
Year built
| Era | % |
|---|---|
| 2020 or later | 2.4% |
| 2010–2019 | 33.2% |
| 2000–2009 | 20.0% |
| 1990–1999 | 18.1% |
| 1980–1989 | 6.6% |
| 1970–1979 | 17.0% |
| 1960–1969 | 0.7% |
| 1950–1959 | 0.6% |
| 1940–1949 | 0.4% |
| 1939 or earlier | 1.0% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.2% |
| 1 bedroom | 2.9% |
| 2 bedrooms | 14.1% |
| 3 bedrooms | 43.0% |
| 4 bedrooms | 27.4% |
| 5+ bedrooms | 12.3% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 2.1% |
| 1 vehicle | 20.5% |
| 2 vehicles | 35.5% |
| 3 or more | 41.8% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 22.7% |
| Electricity | 74.7% |
| Propane / LP gas | 1.0% |
| Wood | 0.7% |
| No fuel used | 0.4% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 4,343 | 69.5% |
| Cohabiting couple | 346 | 5.5% |
| Male householder, no spouse | 579 | 9.3% |
| Female householder, no spouse | 981 | 15.7% |
| Households with children under 18 | 2,548 | 40.8% |
| Households with seniors (65+) | 1,828 | 29.3% |
| Average household size | 2.93 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 30.4% | 22.5% |
| Married | 61.2% | 63.7% |
| Separated | 0.9% | 1.0% |
| Widowed | 0.5% | 5.0% |
| Divorced | 7.0% | 7.7% |
Education
Less than 9th grade
2.4%
Some HS, no diploma
3.3%
HS graduate
16.3%
Some college, no degree
25.5%
Associate's degree
11.4%
Bachelor's degree
23.8%
Graduate / professional
17.3%
| Metric | % |
|---|---|
| HS diploma or higher | 94.2% |
| Bachelor's or higher | 41.1% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 389 | 6.9% |
| Kindergarten | 200 | 3.5% |
| Elementary school | 2,596 | 45.9% |
| High school | 1,589 | 28.1% |
| College / grad school | 879 | 15.5% |
Employment
Industry of employment
Education & healthcare
20.0%
Professional & management
14.7%
Construction
11.6%
Retail trade
8.9%
Other services
8.2%
Transportation & utilities
7.7%
Public administration
7.6%
Arts, food & hospitality
5.6%
Manufacturing
5.3%
Finance & real estate
4.2%
Agriculture & mining
3.1%
Wholesale trade
1.6%
Information
1.6%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 49.2% |
| Service | 15.2% |
| Sales & office | 17.6% |
| Natural resources & construction | 8.6% |
| Production & transportation | 9.4% |
Employment type
| Type | % |
|---|---|
| Private sector | 70.3% |
| Government | 22.1% |
| Self-employed | 7.5% |
| Unpaid family workers | 0.1% |
Commute
| Method | % |
|---|---|
| Drive alone | 75.6% |
| Carpool | 10.7% |
| Public transit | 0.0% |
| Walk | 0.0% |
| Work from home | 13.1% |
| Other means | 0.6% |
| Avg commute (minutes) | 22.2 |
Poverty
All people
6.8%
Under 18 years
8.6%
18 and over
6.0%
Married-couple families
2.9%
Female-led households
31.7%
Income support
| Source | % of households |
|---|---|
| Social Security | 27.9% |
| Retirement income | 25.8% |
| Supplemental Security | 4.4% |
| Cash public assistance | 3.3% |
| Food stamps / SNAP | 8.4% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 31.5% |
| High blood pressure | 27.8% |
| High cholesterol | 33.4% |
| Diabetes | 7.7% |
| Heart disease | 4.8% |
| Stroke | 2.2% |
| Asthma | 10.3% |
| Arthritis | 22.9% |
| Kidney disease | 2.3% |
| Pulmonary disease | 4.9% |
| Cancer | 6.5% |
| Behavior / access | % |
|---|---|
| Smoking | 12.5% |
| Binge drinking | 17.3% |
| No physical activity | 15.1% |
| Less than 7 hrs sleep | 28.8% |
| Depression | 25.9% |
| Fair or poor health | 10.4% |
| Poor mental health | 13.7% |
| Poor physical health | 9.0% |
| No health insurance | 8.4% |
| Visited doctor (checkup) | 71.3% |
| Visited dentist | 72.8% |
| Cholesterol screening | 90.3% |
| Teeth loss | 8.2% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 1,286 | 10.0% |
| Disability | % |
|---|---|
| Any disability | 10.9% |
| Under 18 | 4.7% |
| 18–64 years | 7.4% |
| 65 and over | 34.1% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 76.7% |
| Public insurance | 34.7% |
| No insurance | 4.3% |
| Uninsured under 19 | 2.9% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 17,270 | 94.3% |
| Spanish | 573 | 3.3% |
| Other Indo-European | 272 | 1.6% |
| Asian & Pacific Islander | 94 | 0.5% |
| Other languages | 139 | 0.8% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 16,703 | 91.2% |
| Born in same state | 16,587 | 90.6% |
| Born in different state | 9,583 | 52.3% |
| Foreign born | 116 | 0.6% |
| Naturalized citizen | 1,609 | 8.8% |
| Not a US citizen | 992 | 61.7% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| French | 2,971 | 16.2% |
| Italian | 1,775 | 9.7% |
| Arab | 570 | 3.1% |
| Polish | 548 | 3% |
| Ancestry | Count | % |
|---|---|---|
| English | 431 | 2.4% |
| Dutch | 289 | 1.6% |
| German | 97 | 0.5% |
| Irish | 95 | 0.5% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 34.1% |
| Internet access | 98.4% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 99338
What city is ZIP code 99338 in?
ZIP code 99338 is primarily assigned to Kennewick, Washington.
What county is ZIP code 99338 in?
ZIP code 99338 falls within Benton County, Washington.
Is ZIP code 99338 mostly owner-occupied?
85% of occupied units in ZIP code 99338 are owner-occupied, well above the national average.
What is the typical home value in ZIP code 99338?
The median home value in ZIP code 99338 is $457,300.
Does ZIP code 99338 have a large veteran population?
10% of civilians in ZIP code 99338 are veterans, above the national average of ~7%.
What is the median household income in ZIP code 99338?
The median household income in ZIP code 99338 is $120,020, above the national median of ~$75,000.
What timezone is ZIP code 99338 in?
ZIP code 99338 observes the PST timezone.