Which ZIP code in King County has the fastest population growth?

98101 (Seattle), at 27.1%, among 77 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.

Fastest-growing ZIP codes in King County, WA

These are the 25 ZIP codes in King County with the fastest population growth, out of 77 with at least 1,000 residents. 98101 (Seattle, 27.1%), 98010 (Black Diamond, 22.4%) and 98014 (Carnation, 22.0%) 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.

Fastest-growing ZIP codes in King County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	98101	Seattle	27.1%	17,153	11,722	13,359
2	98010	Black Diamond	22.4%	6,857	2,649	3,560
3	98014	Carnation	22.0%	8,264	2,869	2,508
4	98034	Kirkland	20.8%	52,531	21,726	24,546
5	98354	Milton	19.1%	8,597	3,178	3,402
6	98052	Redmond	14.9%	80,717	34,177	37,646
7	98104	Seattle	13.9%	16,542	9,578	14,051
8	98005	Bellevue	13.6%	21,846	9,097	10,964
9	98109	Seattle	13.0%	34,328	21,883	26,360
10	98002	Auburn	12.1%	37,509	14,269	15,126
11	98001	Auburn	11.2%	37,460	11,982	12,692
12	98106	Seattle	10.6%	28,690	11,791	11,696
13	98004	Bellevue	10.2%	39,897	19,515	21,362
14	98122	Seattle	10.0%	43,234	23,964	27,990
15	98133	Seattle	9.5%	53,249	23,701	25,933
16	98059	Renton	8.8%	42,406	14,520	15,509
17	98121	Seattle	8.6%	21,166	14,288	18,512
18	98188	Seattle	8.5%	27,311	11,430	11,394
19	98108	Seattle	8.0%	25,529	9,016	8,873
20	98074	Sammamish	6.9%	30,761	10,272	10,464
21	98198	Seattle	6.6%	40,463	14,588	15,323
22	98168	Seattle	6.4%	35,528	12,260	13,060
23	98075	Sammamish	6.3%	25,498	8,158	8,615
24	98031	Kent	5.9%	40,094	14,011	14,738
25	98008	Bellevue	5.9%	27,242	9,431	9,729

How we ranked them

Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have at least 1,000 residents. ZIP codes need at least 1,000 residents to be ranked; 77 of 88 qualify.

Which of these to mail, and why

Growing ZIP codes add households every year, which means new homes, new routes and customers without a go-to provider yet. Check the route map: new subdivisions can appear as new carrier routes.

The top five ZIP codes on this list hold 42,144 households, on 57 carrier routes with 47,375 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 98101 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in King County has the fastest population growth?: 98101 (Seattle), at 27.1%, among 77 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have 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.

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