Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/CA/COUNTY/HUMBOLDT

Humboldt County, CA ZIP codes

There are 38 ZIP codes in Humboldt County, CA, in 35 towns, from 95501 to 95589. The largest are 95503 (Eureka), 95501 (Eureka) and 95521 (Arcata).

The county seat is Eureka.

ZIP codes
38
Towns
35
County seat
Eureka
County FIPS
06023
Population
134,541
Median household income
$61,160
Land area
3,568 sq mi
Area codes
369, 707
Metro area
Eureka-Arcata

Humboldt County ZIP codes by town

Eureka (county seat)
95501, 95502, 95503

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

Map of Humboldt County ZIP codes

9550195502955039551195514955189551995521955249552595526955289553495536955379554095542955459554695547955499555095551955539555495555955569555895559955609556295564955659556995570955719557395589

The ZIP codes of Humboldt County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Humboldt County in numbers

About 134,541 people live in Humboldt County, in 54,922 households, the 35th most populous of California's 58 counties. The median household income is $61,160 a year, 38% below the California median of $99,122 (US: $80,734). The median owner-occupied home is valued at $446,900 (39% below the California median), and median gross rent is $1,287 a month. The median age is 39.9; 33.1% of adults 25 and over hold a bachelor's degree or higher (37.1% across California); the average commute takes 19 minutes.

Population134,541Humboldt134,541
Households54,922Humboldt54,922
Median age39.9Humboldt39.9California37.9US 38.9
Median household income$61,160Humboldt$61,160California$99,122US $80,734
Median home value$446,900Humboldt$446,900California$734,700US $332,700
Median gross rent$1,287Humboldt$1,287California$2,036US $1,413
Bachelor's degree or higher33.1%Humboldt33.1%California37.1%US 35.7%
Mean commute19.0 minHumboldt19.0 minCalifornia28.7 minUS 26.4 min
Population density38 / sq miHumboldt38 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Humboldt County

Largest towns in Humboldt County
TownZIP codesPopulation
Eureka 3 26,010
Arcata 2 18,607
Mckinleyville 1 17,113
Fortuna 1 12,326
Cutten 1 3,550
Rio Dell 1 3,349
Hoopa 1 2,233
Bayside 1 1,634
Ferndale 1 1,552
Garberville 1 1,415
Carlotta 1 1,286
Hydesville 1 1,263
Redway 1 1,145
Whitethorn 1 1,115
Willow Creek 1 1,076

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Humboldt County.

Not sure you are in Humboldt County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Humboldt County, with figures

ZIP codes in Humboldt County
ZIP City Type Population Median income Median home
95501 Eureka , CA Standard 22,890 $54,137 $412,300
95502 Eureka , CA No street area — — —
95503 Eureka , CA Standard 25,054 $71,855 $444,700
95511 Alderpoint , CA Standard 71 — —
95514 Blocksburg , CA Standard 85 — —
95518 Arcata , CA No street area — — —
95519 Mckinleyville , CA Standard 18,728 $73,280 $469,400
95521 Arcata , CA Standard 21,980 $53,114 $501,000
95524 Bayside , CA Standard 1,634 $87,500 $601,600
95525 Blue Lake , CA Standard 1,441 $57,379 $478,600
95526 Bridgeville , CA Standard 745 $39,583 $280,600
95528 Carlotta , CA Standard 1,286 $55,481 $506,300
95534 Cutten , CA No street area — — —
95536 Ferndale , CA Standard 3,050 $73,375 $566,000
95537 Fields Landing , CA Standard 532 $78,686 $435,500
95540 Fortuna , CA Standard 14,469 $63,695 $389,500
95542 Garberville , CA Standard 2,463 $46,104 $395,500
95545 Honeydew , CA Standard 194 — $576,900
95546 Hoopa , CA Standard 2,397 $61,607 $253,400
95547 Hydesville , CA Standard 1,263 $96,827 $481,100
95549 Kneeland , CA Standard 1,024 $95,179 $651,600
95550 Korbel , CA Standard 140 $104,063 $2,000,000+
95551 Loleta , CA Standard 1,880 $64,519 $558,100
95553 Miranda , CA Standard 789 $41,450 $446,200
95554 Myers Flat , CA Standard 368 $33,125 $594,800
95555 Orick , CA Standard 216 $39,583 $433,300
95556 Orleans , CA Standard 949 — $311,300
95558 Petrolia , CA Standard 230 $51,719 $566,200
95559 Phillipsville , CA Standard 41 — —
95560 Redway , CA Standard 1,213 $23,720 $391,500
95562 Rio Dell , CA Standard 3,422 $42,975 $305,000
95564 Samoa , CA Standard 444 $78,750 $480,800
95565 Scotia , CA Standard 764 $57,083 $364,600
95569 Redcrest , CA Standard 99 — $287,500
95570 Trinidad , CA Standard 2,640 $74,777 $635,400
95571 Weott , CA Standard 104 — —
95573 Willow Creek , CA Standard 1,089 $47,258 $388,100
95589 Whitethorn , CA Standard 1,115 $43,040 $450,000

Cite this page

zipcodes.pro. “Humboldt County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ca/county/humboldt

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