ZIP Code 94538 — Fremont, CA
94538 is a standard (street delivery) ZIP code serving Fremont, California, in Alameda 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 94538 at a glance
| ZIP code | 94538 |
|---|---|
| Primary city | Fremont |
| State | California (CA) |
| County | Alameda FIPS 06001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 67,781 |
| Coordinates | 37.506530, -121.963610 |
How ZIP+4 works in 94538
The four digits after the hyphen encode a delivery segment inside 94538. 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 94538 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.
Other ZIP codes in Fremont
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 94538.
| ZIP | City | Distance |
|---|---|---|
| 94539 | Fremont, CA | 2.9 mi |
| 94560 | Newark, CA | 3.4 mi |
| 94536 | Fremont, CA | 4.6 mi |
| 95002 | Alviso, CA | 5 mi |
| 95134 | San Jose, CA | 5.4 mi |
| 95035 | Milpitas, CA | 6.5 mi |
| 94555 | Fremont, CA | 7.1 mi |
| 94089 | Sunnyvale, CA | 7.1 mi |
| 94586 | Sunol, CA | 7.5 mi |
| 95054 | Santa Clara, CA | 7.8 mi |
| 94587 | Union City, CA | 8.3 mi |
| 94085 | Sunnyvale, CA | 8.7 mi |
Questions about 94538
What is the ZIP+4 code for 94538?
94538 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 94538, you need to look up a specific street address to get them.
What city is 94538?
94538 is assigned to Fremont, California, in Alameda 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.