| ZIP Codes: | 38 ZIP Codes (29 Standard, 9 PO Box, 0 Unique) [See All] |
| Area Codes: | 369 / 530 / 707 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:11:28 PM |
| Population: | 134,809 [See All] |
| FIPS: | 06023 |
| CBSA: | Eureka-Arcata, CA |
| Land Area: | 3,530 sq mi |
| Water Area: | 46 sq mi |
| Coordinates: | 40.6117, -123.9645 |
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134,809 residents live across 38 ZIPs covering 3,530 sq mi, served by 35 distinct USPS-recognized cities.
Population moved from 134,935 to 134,809 from 2014 to 2024 — a -0.1% change. 13 ZIPs gained residents, 22 lost.
The county's wealthiest ZIP 95547 (Hydesville, $96,827 median) and poorest ZIP 95560 (Redway, $23,720) are 31.8 miles apart — a 4.1× income gap across local geography.
Median home values vary 2.6× across this county — from $253,400 in 95546 (Hoopa) to $651,600 in 95549 (Kneeland).
Density varies 819× across the county — from 4 people/sq mi in 95526 (Bridgeville) to 3,259 in 95501 (Eureka).
Educational attainment ranges from 12.9% bachelor's+ in 95562 (Rio Dell) to 59.7% in 95524 (Bayside) — the breadth of educational profiles across the area.
Within California, this is the #35 most populous of 58 counties and ranks #54 for median household income .
Weighted by population, the typical household earns about $62,480 across the county — reflecting what a typical resident sees, not a simple ZIP average.
33.1% of adults age 25+ hold a bachelor's degree or higher (30,837 of 93,256 reporting).
29 Standard delivery, 9 PO Box only, 0 single-entity Unique ZIPs serve this county.
Median household income spans 4.1× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 95503 | Eureka | Standard | 25,054 | $71,855 | 89.8 | 0.6% |
| 95501 | Eureka | Standard | 22,890 | $54,137 | 7.0 | -3.7% |
| 95521 | Arcata | Standard | 21,980 | $53,114 | 64.8 | 5.8% |
| 95519 | Mckinleyville | Standard | 18,728 | $73,280 | 89.1 | 1.3% |
| 95540 | Fortuna | Standard | 14,469 | $63,695 | 44.1 | 11.2% |
| 95562 | Rio Dell | Standard | 3,422 | $42,975 | 5.1 | -0.4% |
| 95536 | Ferndale | Standard | 3,050 | $73,375 | 242.2 | -0.9% |
| 95570 | Trinidad | Standard | 2,640 | $74,777 | 111.2 | 26.7% |
| 95542 | Garberville | Standard | 2,463 | $46,104 | 364.8 | -9.4% |
| 95546 | Hoopa | Standard | 2,397 | $61,607 | 382.4 | -30.2% |
| 95551 | Loleta | Standard | 1,880 | $64,519 | 50.9 | 3.0% |
| 95524 | Bayside | Standard | 1,634 | $87,500 | 6.9 | -14.1% |
| 95525 | Blue Lake | Standard | 1,441 | $57,379 | 236.4 | -13.6% |
| 95528 | Carlotta | Standard | 1,286 | $55,481 | 100.8 | 1.0% |
| 95547 | Hydesville | Standard | 1,263 | $96,827 | 7.1 | -6.2% |
| 95560 | Redway | Standard | 1,213 | $23,720 | 25.3 | -11.7% |
| 95589 | Whitethorn | Standard | 1,115 | $43,040 | 112.5 | -9.1% |
| 95573 | Willow Creek | Standard | 1,089 | $47,258 | 100.8 | -24.0% |
| 95549 | Kneeland | Standard | 1,024 | $95,179 | 196.7 | 17.8% |
| 95556 | Orleans | PO Box | 949 | — | 189.7 | 44.9% |
| 95553 | Miranda | PO Box | 789 | $41,450 | 91.2 | -32.7% |
| 95565 | Scotia | Standard | 764 | $57,083 | 43.8 | -30.0% |
| 95526 | Bridgeville | Standard | 745 | $39,583 | 187.3 | 214.3% |
| 95537 | Fields Landing | PO Box | 532 | $78,686 | 0.2 | 309.2% |
| 95564 | Samoa | Standard | 444 | $78,750 | 3.4 | -11.2% |
| 95554 | Myers Flat | Standard | 368 | $33,125 | 36.6 | 13.2% |
| 95558 | Petrolia | Standard | 230 | $51,719 | 187.1 | -36.1% |
| 95555 | Orick | Standard | 216 | $39,583 | 78.1 | -34.3% |
| 95545 | Honeydew | PO Box | 194 | — | 0.0 | 96.0% |
| 95550 | Korbel | Standard | 140 | $104,063 | 179.9 | -48.0% |
| 95571 | Weott | PO Box | 104 | — | 22.4 | -31.6% |
| 95569 | Redcrest | Standard | 99 | — | 119.1 | -64.3% |
| 95514 | Blocksburg | Standard | 85 | — | 96.4 | -50.0% |
| 95511 | Alderpoint | Standard | 71 | — | 56.3 | -84.3% |
| 95559 | Phillipsville | PO Box | 41 | — | 1.1 | -60.2% |
| 95534 | Cutten | PO Box | — | — | 0.0 | — |
| 95502 | Eureka | PO Box | — | — | 0.0 | — |
| 95518 | Arcata | PO Box | — | — | 0.0 | — |