What city is 99338 in?

99338 is a Kennewick, WA mailing address. By land area, 16% lies inside Kennewick and 1% lies inside Richland; the rest is outside any Census-defined city or community.

What is the population of 99338?

About 20,633 people (±1,230), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 19,117.

What is the median household income in 99338?

$111,042 (±$8,997), compared with $98,141 for Washington as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 99338?

14 USPS carrier routes with 8,749 residential and 223 business mailboxes (8,972 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 99338?

The closest, measured center to center: 99352 (5.1 mi, Richland), 99336 (5.5 mi, Kennewick), 99346 (10 mi), 99354 (10.8 mi, Richland), 99353 (11.1 mi, West Richland) and 99337 (11.9 mi, Finley).

99338 ZIP Code, Kennewick, WA

99338 is a ZIP code in Kennewick, Washington in Benton County. It covers 35 square miles of land. The closest ZIP codes are 99352, 99336 and 99346. 20,633 people live here in 6,937 households. With about 582 people per square mile it is lightly settled, and most homes are owner-occupied (82%). Median household income is $111,042, above the Washington median of $98,141; 40% of households have children under 18.

Quick facts

Mailing city: Kennewick, WA
County: Benton County
Land area: 35 sq mi
Population: 20,633
Median household income: $111,042
Carrier routes: 14 (8,749 homes)

Key figures

Measure	Value
Residents	20,633
Households	6,937
Median household income	$111,042
Income per person	$49,238
Median age	37.6
Homeowners	81.9%
Median home value	$551,500
Median rent	$1,486
Bachelor's degree or higher	39.3%
Average commute (minutes)	21.8
Households with kids under 18	40.4%
Moved in the past year	9.1%
Below the poverty line	8.5%
Broadband internet	95.0%
Speak a non-English language at home	18.1%

Household income

% of households	Value
<$10K	2.1%
$10–15K	1.1%
$15–25K	2.1%
$25–35K	3.0%
$35–50K	7.3%
$50–75K	14.6%
$75–100K	12.7%
$100–150K	22.1%
$150–200K	13.5%
$200K+	21.5%

Age

% of all residents	Value
<10	15.7%
10–19	17.5%
20–24	4.6%
25–34	8.4%
35–44	16.3%
45–54	11.0%
55–64	10.3%
65–74	10.7%
75+	5.5%

Tenure

% of housing units	Value
Owned, with mortgage	55.8%
Owned outright	23.4%
Rented	17.3%
Vacant	3.5%

Type of building

% of housing units	Value
Detached house	81.9%
Townhome	0.9%
2–4 units	2.3%
5–19 units	1.3%
20+ units	8.9%
Mobile / other	4.7%

Businesses in 99338

346 business establishments with 3,543 employees (ZIP Codes Business Patterns 2023).

Construction: 79
Professional, Scientific, and Technical Services: 47
Health Care and Social Assistance: 47
Real Estate and Rental and Leasing: 43
Accommodation and Food Services: 23
Wholesale Trade: 15
Retail Trade: 15
Other Services (except Public Administration): 15

EDDM carrier routes

99338 has 14 USPS carrier routes with 8,749 residential and 223 business mailboxes. Open the EDDM route map.

Carrier routes in 99338

99338 has 14 USPS carrier routes (14 rural (R)) with 8,749 residential and 223 business mailboxes. Routes range from 346 homes (R051) to 1,059 homes (R027); the median route has 559 homes. The Census counted 6,937 households in 99338 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	6
500–749	4
750–999	2
1,000–1,499	2
1,500+	0

Best routes in 99338 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route R039 — USPS business mailboxes 81, 683 homes
Route R027 — USPS business mailboxes 73, 1,059 homes
Route R029 — USPS business mailboxes 25, 424 homes
Route R040 — USPS business mailboxes 24, 435 homes
Route R047 — USPS business mailboxes 6, 571 homes

Select these 5 routes on the route map

Every carrier route in 99338

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
R004	Rural	480	3	$163,113	—	—	—
R007	Rural	766	4	$131,969	—	—	—
R008	Rural	649	0	$113,360	—	—	—
R017	Rural	429	1	$161,880	—	—	—
R020	Rural	546	3	$131,969	—	—	—
R027	Rural	1,059	73	$81,077	—	—	—
R029	Rural	424	25	$163,113	—	—	—
R037	Rural	1,018	1	$81,077	—	—	—
R039	Rural	683	81	$93,836	—	—	—
R040	Rural	435	24	$138,173	—	—	—
R044	Rural	933	1	$81,077	—	—	—
R047	Rural	571	6	$163,113	—	—	—
R050	Rural	410	0	$163,113	—	—	—
R051	Rural	346	1	$163,113	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 99338 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

99352 — Richland city, WA (5.1 mi)
99336 — Kennewick city, WA (5.5 mi)
99346 (10 mi)
99354 — Richland city, WA (10.8 mi)
99353 — West Richland city, WA (11.1 mi)
99337 — Finley CDP, WA (11.9 mi)
99320 — West Richland city, WA (15.2 mi)
97882 — Umatilla city, OR (18.8 mi)

Areas that include 99338

Where it ranks

Mail every home in 99338

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 99338, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 99338 in?: 99338 is a Kennewick, WA mailing address. By land area, 16% lies inside Kennewick and 1% lies inside Richland; the rest is outside any Census-defined city or community.
What county is 99338 in?: 99338 is in Benton County.
What is the population of 99338?: About 20,633 people (±1,230), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 19,117.
What is the median household income in 99338?: $111,042 (±$8,997), compared with $98,141 for Washington as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 99338?: 14 USPS carrier routes with 8,749 residential and 223 business mailboxes (8,972 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 99338?: The closest, measured center to center: 99352 (5.1 mi, Richland), 99336 (5.5 mi, Kennewick), 99346 (10 mi), 99354 (10.8 mi, Richland), 99353 (11.1 mi, West Richland) and 99337 (11.9 mi, Finley).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.