Which ZIP code in King County has the lowest median age?

98195 (Seattle), at 19.3 (±0.4), among 78 ZIP codes with at least 1,000 residents.

Why are some ZIP codes missing?

ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

Youngest ZIP codes in King County, WA

These are the 25 ZIP codes in King County with the lowest median age, out of 78 with at least 1,000 residents. 98195 (Seattle, 19.3), 98105 (Seattle, 24.6) and 98109 (Seattle, 31.7) lead the list. There is no single "best" ZIP code in King County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Youngest ZIP codes in King County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	98195	Seattle	19.3 ±0.4	2,757	5	—
2	98105	Seattle	24.6 ±0.7	49,767	18,756	22,444
3	98109	Seattle	31.7 ±0.7	34,328	21,883	26,360
4	98122	Seattle	32.4 ±0.8	43,234	23,964	27,990
5	98032	Kent	32.9 ±1.3	40,862	14,675	16,598
6	98007	Bellevue	33.0 ±1.4	27,692	11,673	12,422
7	98121	Seattle	33.2 ±1.1	21,166	14,288	18,512
8	98055	Renton	33.5 ±1.7	24,660	9,648	10,160
9	98102	Seattle	33.8 ±0.7	27,333	17,489	18,763
10	98101	Seattle	33.8 ±1.1	17,153	11,722	13,359
11	98119	Seattle	34.1 ±1.0	26,879	14,249	14,169
12	98107	Seattle	34.2 ±0.9	28,776	15,835	17,496
13	98103	Seattle	34.5 ±0.8	52,671	26,873	29,056
14	98030	Kent	35.1 ±1.5	38,523	13,113	13,773
15	98052	Redmond	35.2 ±0.8	80,717	34,177	37,646
16	98003	Federal Way	35.7 ±1.7	51,619	18,786	20,162
17	98002	Auburn	35.9 ±1.6	37,509	14,269	15,126
18	98198	Seattle	36.1 ±2.0	40,463	14,588	15,323
19	98106	Seattle	36.3 ±0.8	28,690	11,791	11,696
20	98148	Seattle	36.4 ±2.8	9,715	3,954	4,542
21	98092	Auburn	36.5 ±0.7	50,224	16,618	17,242
22	98108	Seattle	36.9 ±1.0	25,529	9,016	8,873
23	98034	Kirkland	37.1 ±1.1	52,531	21,726	24,546
24	98029	Issaquah	37.2 ±1.3	30,586	12,115	12,665
25	98125	Seattle	37.3 ±1.2	44,520	20,688	22,105

How we ranked them

Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 78 of 88 qualify.

Which of these to mail, and why

Younger ZIP codes skew toward renters, students and young families: fitness, quick-service food, apartments, entertainment and first-time-buyer offers.

The top five ZIP codes on this list hold 79,283 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 98195 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

Map it and price it

EDDM guides

Frequently asked questions

Which ZIP code in King County has the lowest median age?: 98195 (Seattle), at 19.3 (±0.4), among 78 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024).
Why are some ZIP codes missing?: ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

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