ZIP Code 95423 — Clearlake Oaks, CA
95423 is a standard (street delivery) ZIP code serving Clearlake Oaks, California, in Lake 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 95423 at a glance
| ZIP code | 95423 |
|---|---|
| Primary city | Clearlake Oaks |
| State | California (CA) |
| County | Lake FIPS 06033 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 3,513 |
| Coordinates | 39.067490, -122.627530 |
How ZIP+4 works in 95423
The four digits after the hyphen encode a delivery segment inside 95423. 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 95423 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 95423.
| ZIP | City | Distance |
|---|---|---|
| 95443 | Glenhaven, CA | 6.1 mi |
| 95422 | Clearlake, CA | 6.2 mi |
| 95458 | Lucerne, CA | 8.9 mi |
| 95464 | Nice, CA | 12.5 mi |
| 95451 | Kelseyville, CA | 13 mi |
| 95457 | Lower Lake, CA | 14 mi |
| 95435 | Finley, CA | 14 mi |
| 95453 | Lakeport, CA | 16.8 mi |
| 95426 | Cobb, CA | 17.1 mi |
| 95979 | Stonyford, CA | 17.8 mi |
| 95467 | Hidden Valley Lake, CA | 18.6 mi |
| 95485 | Upper Lake, CA | 18.7 mi |
Questions about 95423
What is the ZIP+4 code for 95423?
95423 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 95423, you need to look up a specific street address to get them.
What city is 95423?
95423 is assigned to Clearlake Oaks, California, in Lake 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.