ZIP Code 95573 — Willow Creek, CA
95573 is a standard (street delivery) ZIP code serving Willow Creek, California, in Humboldt County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 95573 at a glance
| ZIP code | 95573 |
|---|---|
| Primary city | Willow Creek |
| State | California (CA) |
| County | Humboldt FIPS 06023 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 1,089 |
| Coordinates | 40.895670, -123.658730 |
How ZIP+4 works in 95573
The four digits after the hyphen encode a delivery segment inside 95573. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 95573 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 95573.
| ZIP | City | Distance |
|---|---|---|
| 95563 | Salyer, CA | 8.5 mi |
| 95525 | Blue Lake, CA | 9.5 mi |
| 95550 | Korbel, CA | 12.1 mi |
| 95527 | Burnt Ranch, CA | 12.8 mi |
| 95549 | Kneeland, CA | 20.5 mi |
| 95521 | Arcata, CA | 20.6 mi |
| 95546 | Hoopa, CA | 20.7 mi |
| 95519 | Mckinleyville, CA | 20.9 mi |
| 95524 | Bayside, CA | 21.1 mi |
| 96010 | Big Bar, CA | 21.6 mi |
| 96046 | Hyampom, CA | 22.9 mi |
| 95503 | Eureka, CA | 25.5 mi |
Questions about 95573
What is the ZIP+4 code for 95573?
95573 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 95573, you need to look up a specific street address to get them.
What city is 95573?
95573 is assigned to Willow Creek, California, in Humboldt County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.