ZIP Code 90755 — Signal Hill, CA
90755 is a standard (street delivery) ZIP code serving Signal Hill, California, in Los Angeles 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 90755 at a glance
| ZIP code | 90755 |
|---|---|
| Primary city | Signal Hill |
| State | California (CA) |
| County | Los Angeles FIPS 06037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 11,521 |
| Coordinates | 33.802740, -118.167470 |
How ZIP+4 works in 90755
The four digits after the hyphen encode a delivery segment inside 90755. 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 90755 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 90755.
| ZIP | City | Distance |
|---|---|---|
| 90806 | Long Beach, CA | 0.7 mi |
| 90804 | Long Beach, CA | 1.8 mi |
| 90807 | Long Beach, CA | 2.1 mi |
| 90813 | Long Beach, CA | 2.2 mi |
| 90814 | Long Beach, CA | 2.6 mi |
| 90840 | Long Beach, CA | 2.9 mi |
| 90831 | Long Beach, CA | 3 mi |
| 90815 | Long Beach, CA | 3 mi |
| 90822 | Long Beach, CA | 3.3 mi |
| 90810 | Long Beach, CA | 3.3 mi |
| 90712 | Lakewood, CA | 3.4 mi |
| 90808 | Long Beach, CA | 3.5 mi |
Questions about 90755
What is the ZIP+4 code for 90755?
90755 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 90755, you need to look up a specific street address to get them.
What city is 90755?
90755 is assigned to Signal Hill, California, in Los Angeles 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.