What city is 98031 in?

98031 is a Kent, WA mailing address. By land area, 100% lies inside Kent.

What is the population of 98031?

About 40,094 people (±1,860), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 43,055.

What is the median household income in 98031?

$105,965 (±$12,994), 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 98031?

15 USPS carrier routes with 14,738 residential and 398 business mailboxes (15,136 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 98031?

The closest, measured center to center: 98030 (2.7 mi, Kent), 98055 (2.9 mi, Renton), 98032 (3.2 mi, Kent), 98058 (3.9 mi, Fairwood), 98042 (4.6 mi, Lake Morton-Berrydale) and 98057 (4.7 mi, Renton).

98031 ZIP Code, Kent, WA

98031 is a ZIP code in Kent, Washington in King County. It covers 7.7 square miles of land. The closest ZIP codes are 98030, 98055 and 98032. 40,094 people live here in 14,011 households, more than in 9 of every 10 Washington ZIP codes. At about 5,185 people per square mile it is built up to city-neighborhood density, and owners and renters are mixed (67% own). Median household income is $105,965, close to the Washington median of $98,141.

Quick facts

Mailing city: Kent, WA
County: King County
Land area: 7.7 sq mi
Population: 40,094
Median household income: $105,965
Carrier routes: 15 (14,738 homes)

Key figures

Measure	Value
Residents	40,094
Households	14,011
Median household income	$105,965
Income per person	$46,315
Median age	38.1
Homeowners	67.2%
Median home value	$611,600
Median rent	$1,991
Bachelor's degree or higher	32.1%
Average commute (minutes)	30.5
Households with kids under 18	34.4%
Moved in the past year	12.7%
Below the poverty line	10.4%
Broadband internet	96.7%
Speak a non-English language at home	43.1%

Household income

% of households	Value
<$10K	4.0%
$10–15K	1.1%
$15–25K	4.0%
$25–35K	3.2%
$35–50K	10.0%
$50–75K	13.9%
$75–100K	12.2%
$100–150K	21.7%
$150–200K	12.8%
$200K+	17.1%

Age

% of all residents	Value
<10	12.6%
10–19	11.4%
20–24	6.0%
25–34	15.3%
35–44	14.1%
45–54	13.3%
55–64	14.4%
65–74	8.5%
75+	4.4%

Tenure

% of housing units	Value
Owned, with mortgage	44.1%
Owned outright	20.8%
Rented	31.1%
Vacant	4.0%

Type of building

% of housing units	Value
Detached house	67.6%
Townhome	3.5%
2–4 units	4.4%
5–19 units	15.1%
20+ units	5.8%
Mobile / other	3.6%

Businesses in 98031

727 business establishments with 8,748 employees (ZIP Codes Business Patterns 2023).

Construction: 131
Health Care and Social Assistance: 92
Transportation and Warehousing: 67
Retail Trade: 63
Accommodation and Food Services: 62
Wholesale Trade: 57
Other Services (except Public Administration): 57
Real Estate and Rental and Leasing: 48

EDDM carrier routes

98031 has 15 USPS carrier routes with 14,738 residential and 398 business mailboxes. Open the EDDM route map.

Carrier routes in 98031

98031 has 15 USPS carrier routes (15 city (C)) with 14,738 residential and 398 business mailboxes. Routes range from 321 homes (C013) to 1,357 homes (C018); the median route has 976 homes. The Census counted 14,011 households in 98031 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	1
500–749	0
750–999	8
1,000–1,499	6
1,500+	0

Best routes in 98031 for…

Most businesses

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

Route C018 — USPS business mailboxes 186, 1,357 homes
Route C017 — USPS business mailboxes 100, 1,151 homes
Route C081 — USPS business mailboxes 36, 1,163 homes
Route C047 — USPS business mailboxes 32, 1,021 homes
Route C070 — USPS business mailboxes 18, 944 homes

Select these 5 routes on the route map

Every carrier route in 98031

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C007	City	1,184	5	$53,488	—	—	—
C013	City	321	0	$154,828	—	—	—
C017	City	1,151	100	$53,488	—	—	—
C018	City	1,357	186	$33,062	—	—	—
C022	City	949	6	$133,847	—	—	—
C028	City	890	3	$92,848	—	—	—
C034	City	882	5	$113,975	—	—	—
C036	City	941	0	$133,847	—	—	—
C040	City	976	1	$133,847	—	—	—
C047	City	1,021	32	$154,828	—	—	—
C053	City	970	2	$153,677	—	—	—
C066	City	1,009	2	$105,458	—	—	—
C070	City	944	18	$133,847	—	—	—
C076	City	980	2	$113,975	—	—	—
C081	City	1,163	36	$155,828	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 98031 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

98030 — Kent city, WA (2.7 mi)
98055 — Renton city, WA (2.9 mi)
98032 — Kent city, WA (3.2 mi)
98058 — Fairwood CDP, WA (3.9 mi)
98042 — Lake Morton-Berrydale CDP, WA (4.6 mi)
98057 — Renton city, WA (4.7 mi)
98188 — Tukwila city, WA (4.7 mi)
98198 — Des Moines city, WA (5.8 mi)

Areas that include 98031

Where it ranks

Mail every home in 98031

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) 98031, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 98031 in?: 98031 is a Kent, WA mailing address. By land area, 100% lies inside Kent.
What county is 98031 in?: 98031 is in King County.
What is the population of 98031?: About 40,094 people (±1,860), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 43,055.
What is the median household income in 98031?: $105,965 (±$12,994), 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 98031?: 15 USPS carrier routes with 14,738 residential and 398 business mailboxes (15,136 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 98031?: The closest, measured center to center: 98030 (2.7 mi, Kent), 98055 (2.9 mi, Renton), 98032 (3.2 mi, Kent), 98058 (3.9 mi, Fairwood), 98042 (4.6 mi, Lake Morton-Berrydale) and 98057 (4.7 mi, Renton).

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