Which ZIP code in Seattle has the highest median age?

98177 (Seattle), at 45.8 (±1.8), among 33 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.

Oldest ZIP codes in Seattle, WA

These are the 25 ZIP codes in Seattle, WA with the highest median age, out of 33 with at least 1,000 residents. 98177 (Seattle, 45.8), 98166 (Seattle, 43.6) and 98155 (Seattle, 40.7) lead the list. There is no single "best" ZIP code in Seattle; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Oldest ZIP codes in Seattle

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	98177	Seattle	45.8 ±1.8	21,090	8,134	8,181
2	98166	Seattle	43.6 ±1.9	22,082	8,961	9,699
3	98155	Seattle	40.7 ±1.7	36,511	14,344	16,373
4	98136	Seattle	40.7 ±2.8	17,252	7,921	7,934
5	98116	Seattle	40.6 ±1.7	28,711	14,051	15,176
6	98112	Seattle	40.4 ±1.5	23,921	10,918	11,456
7	98146	Seattle	40.3 ±0.9	28,573	10,617	11,029
8	98117	Seattle	40.2 ±1.1	35,711	14,983	16,086
9	98133	Seattle	39.7 ±1.3	53,249	23,701	25,933
10	98178	Seattle	39.7 ±1.6	26,748	9,349	9,572
11	98199	Seattle	39.5 ±1.2	22,468	10,052	9,948
12	98118	Seattle	38.4 ±1.1	50,500	19,176	21,274
13	98144	Seattle	38.4 ±1.5	33,787	16,019	20,158
14	98168	Seattle	38.0 ±1.8	35,528	12,260	13,060
15	98126	Seattle	37.6 ±1.1	22,975	10,248	11,137
16	98115	Seattle	37.5 ±0.9	54,349	23,843	26,226
17	98188	Seattle	37.5 ±2.1	27,311	11,430	11,394
18	98104	Seattle	37.5 ±1.8	16,542	9,578	14,051
19	98125	Seattle	37.3 ±1.2	44,520	20,688	22,105
20	98108	Seattle	36.9 ±1.0	25,529	9,016	8,873
21	98148	Seattle	36.4 ±2.8	9,715	3,954	4,542
22	98106	Seattle	36.3 ±0.8	28,690	11,791	11,696
23	98198	Seattle	36.1 ±2.0	40,463	14,588	15,323
24	98103	Seattle	34.5 ±0.8	52,671	26,873	29,056
25	98107	Seattle	34.2 ±0.9	28,776	15,835	17,496

How we ranked them

Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 33 of 38 qualify.

Which of these to mail, and why

Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.

The top five ZIP codes on this list hold 53,411 households, on 97 carrier routes with 57,363 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 98177 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Seattle has the highest median age?: 98177 (Seattle), at 45.8 (±1.8), among 33 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, highest 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.