35 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 95503 | Eureka | 25,054 |
| 95501 | Eureka | 22,890 |
| 95521 | Arcata | 21,980 |
| 95519 | Mckinleyville | 18,728 |
| 95540 | Fortuna | 14,469 |
| 95562 | Rio Dell | 3,422 |
| 95536 | Ferndale | 3,050 |
| 95570 | Trinidad | 2,640 |
| 95542 | Garberville | 2,463 |
| 95546 | Hoopa | 2,397 |
| 95551 | Loleta | 1,880 |
| 95524 | Bayside | 1,634 |
| 95525 | Blue Lake | 1,441 |
| 95528 | Carlotta | 1,286 |
| 95547 | Hydesville | 1,263 |
| 95560 | Redway | 1,213 |
| 95589 | Whitethorn | 1,115 |
| 95573 | Willow Creek | 1,089 |
| 95549 | Kneeland | 1,024 |
| 95556 | Orleans | 949 |
| 95553 | Miranda | 789 |
| 95565 | Scotia | 764 |
| 95526 | Bridgeville | 745 |
| 95537 | Fields Landing | 532 |
| 95564 | Samoa | 444 |
| 95554 | Myers Flat | 368 |
| 95558 | Petrolia | 230 |
| 95555 | Orick | 216 |
| 95545 | Honeydew | 194 |
| 95550 | Korbel | 140 |
| 95571 | Weott | 104 |
| 95569 | Redcrest | 99 |
| 95514 | Blocksburg | 85 |
| 95511 | Alderpoint | 71 |
| 95559 | Phillipsville | 41 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 35 ZCTAs in Humboldt County, California (US Census).