ZIP Code 94939 — Larkspur, CA
94939 is a standard (street delivery) ZIP code serving Larkspur, California, in Marin 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 94939 at a glance
| ZIP code | 94939 |
|---|---|
| Primary city | Larkspur |
| State | California (CA) |
| County | Marin FIPS 06041 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 7,315 |
| Coordinates | 37.937250, -122.535180 |
How ZIP+4 works in 94939
The four digits after the hyphen encode a delivery segment inside 94939. 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 94939 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 94939.
| ZIP | City | Distance |
|---|---|---|
| 94904 | Greenbrae, CA | 1.2 mi |
| 94925 | Corte Madera, CA | 1.5 mi |
| 94957 | Ross, CA | 2.3 mi |
| 94964 | San Quentin, CA | 2.4 mi |
| 94901 | San Rafael, CA | 3.5 mi |
| 94941 | Mill Valley, CA | 3.7 mi |
| 94930 | Fairfax, CA | 4.7 mi |
| 94960 | San Anselmo, CA | 4.8 mi |
| 94920 | Belvedere Tiburon, CA | 5.1 mi |
| 94965 | Sausalito, CA | 5.9 mi |
| 94903 | San Rafael, CA | 6.1 mi |
| 94970 | Stinson Beach, CA | 6.7 mi |
Questions about 94939
What is the ZIP+4 code for 94939?
94939 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 94939, you need to look up a specific street address to get them.
What city is 94939?
94939 is assigned to Larkspur, California, in Marin 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.