35 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 95503 | Eureka | 24,442 |
| 95501 | Eureka | 22,972 |
| 95521 | Arcata | 21,684 |
| 95519 | Mckinleyville | 18,792 |
| 95540 | Fortuna | 14,641 |
| 95562 | Rio Dell | 3,384 |
| 95536 | Ferndale | 3,360 |
| 95542 | Garberville | 2,831 |
| 95570 | Trinidad | 2,480 |
| 95546 | Hoopa | 2,436 |
| 95551 | Loleta | 1,870 |
| 95524 | Bayside | 1,770 |
| 95589 | Whitethorn | 1,467 |
| 95525 | Blue Lake | 1,443 |
| 95528 | Carlotta | 1,415 |
| 95560 | Redway | 1,350 |
| 95547 | Hydesville | 1,144 |
| 95549 | Kneeland | 1,090 |
| 95573 | Willow Creek | 990 |
| 95565 | Scotia | 891 |
| 95526 | Bridgeville | 887 |
| 95556 | Orleans | 854 |
| 95553 | Miranda | 734 |
| 95537 | Fields Landing | 512 |
| 95564 | Samoa | 477 |
| 95554 | Myers Flat | 352 |
| 95555 | Orick | 349 |
| 95545 | Honeydew | 335 |
| 95558 | Petrolia | 244 |
| 95550 | Korbel | 206 |
| 95569 | Redcrest | 190 |
| 95571 | Weott | 112 |
| 95514 | Blocksburg | 81 |
| 95511 | Alderpoint | 77 |
| 95559 | Phillipsville | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 35 ZCTAs in Humboldt County, California (US Census).