ZIP Code 90740 — Seal Beach, CA
90740 is a standard (street delivery) ZIP code serving Seal Beach, California, in Orange 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 90740 at a glance
| ZIP code | 90740 |
|---|---|
| Primary city | Seal Beach |
| State | California (CA) |
| County | Orange FIPS 06059 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 24,254 |
| Coordinates | 33.754610, -118.071290 |
How ZIP+4 works in 90740
The four digits after the hyphen encode a delivery segment inside 90740. 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 90740 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 90740.
| ZIP | City | Distance |
|---|---|---|
| 90743 | Surfside, CA | 1.9 mi |
| 90742 | Sunset Beach, CA | 2.5 mi |
| 92649 | Huntington Beach, CA | 2.8 mi |
| 90720 | Los Alamitos, CA | 2.9 mi |
| 90803 | Long Beach, CA | 2.9 mi |
| 90822 | Long Beach, CA | 3.2 mi |
| 92845 | Garden Grove, CA | 3.2 mi |
| 90840 | Long Beach, CA | 3.5 mi |
| 90815 | Long Beach, CA | 3.8 mi |
| 92647 | Huntington Beach, CA | 4.3 mi |
| 90814 | Long Beach, CA | 4.3 mi |
| 92683 | Westminster, CA | 4.4 mi |
Questions about 90740
What is the ZIP+4 code for 90740?
90740 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 90740, you need to look up a specific street address to get them.
What city is 90740?
90740 is assigned to Seal Beach, California, in Orange 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.