ZIP Code 94940 — Marshall, CA
94940 is a standard (street delivery) ZIP code serving Marshall, 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 94940 at a glance
| ZIP code | 94940 |
|---|---|
| Primary city | Marshall |
| State | California (CA) |
| County | Marin FIPS 06041 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 148 |
| Coordinates | 38.157540, -122.863760 |
How ZIP+4 works in 94940
The four digits after the hyphen encode a delivery segment inside 94940. 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 94940 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 94940.
| ZIP | City | Distance |
|---|---|---|
| 94937 | Inverness, CA | 5.5 mi |
| 94971 | Tomales, CA | 5.7 mi |
| 94952 | Petaluma, CA | 7.4 mi |
| 94956 | Point Reyes Station, CA | 8.1 mi |
| 94929 | Dillon Beach, CA | 8.6 mi |
| 94950 | Olema, CA | 10.9 mi |
| 94946 | Nicasio, CA | 11.2 mi |
| 94938 | Lagunitas, CA | 11.4 mi |
| 94972 | Valley Ford, CA | 13 mi |
| 94947 | Novato, CA | 13.3 mi |
| 94933 | Forest Knolls, CA | 13.6 mi |
| 94931 | Cotati, CA | 13.9 mi |
Questions about 94940
What is the ZIP+4 code for 94940?
94940 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 94940, you need to look up a specific street address to get them.
What city is 94940?
94940 is assigned to Marshall, 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.