Which ZIP code in Humboldt County has the highest median age?

95573 (Willow Creek), at 60.7 (±3.0), among 19 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 Humboldt County, CA

These are the 19 ZIP codes in Humboldt County with the highest median age, out of 19 with at least 1,000 residents. 95573 (Willow Creek, 60.7), 95525 (Blue Lake, 59.4) and 95528 (Carlotta, 54.2) lead the list. There is no single "best" ZIP code in Humboldt County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Oldest ZIP codes in Humboldt County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	95573	Willow Creek	60.7 ±3.0	1,089	618	2
2	95525	Blue Lake	59.4 ±11.2	1,441	761	73
3	95528	Carlotta	54.2 ±10.1	1,286	527	367
4	95589	Whitethorn	52.7 ±19.4	1,115	574	507
5	95547	Hydesville	52.4 ±12.5	1,263	491	182
6	95536	Ferndale	51.7 ±12.0	3,050	1,307	684
7	95542	Garberville	48.8 ±7.8	2,463	1,202	877
8	95570	Trinidad	47.7 ±3.7	2,640	1,171	758
9	95560	Redway	47.0 ±17.1	1,213	611	19
10	95524	Bayside	46.7 ±5.7	1,634	658	665
11	95519	Mckinleyville	41.7 ±1.3	18,728	7,429	8,106
12	95503	Eureka	41.4 ±2.2	25,054	9,982	10,223
13	95501	Eureka	39.5 ±2.1	22,890	9,264	10,419
14	95540	Fortuna	39.1 ±3.7	14,469	5,689	5,962
15	95549	Kneeland	36.2 ±7.5	1,024	333	365
16	95562	Rio Dell	36.0 ±8.1	3,422	1,518	1,420
17	95551	Loleta	34.9 ±4.9	1,880	711	282
18	95546	Hoopa	32.1 ±7.2	2,397	776	162
19	95521	Arcata	29.2 ±1.6	21,980	9,225	9,391

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; 19 of 35 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 2,971 households, on 5 carrier routes with 1,131 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 95573 on the EDDM route map

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Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Humboldt County has the highest median age?: 95573 (Willow Creek), at 60.7 (±3.0), among 19 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.