ZIP Code 94591 — Vallejo, CA
94591 is a standard (street delivery) ZIP code serving Vallejo, California, in Solano 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 94591 at a glance
| ZIP code | 94591 |
|---|---|
| Primary city | Vallejo |
| State | California (CA) |
| County | Solano FIPS 06095 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 58,193 |
| Coordinates | 38.127020, -122.196350 |
How ZIP+4 works in 94591
The four digits after the hyphen encode a delivery segment inside 94591. 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 94591 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 Vallejo
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 94591.
| ZIP | City | Distance |
|---|---|---|
| 94589 | Vallejo, CA | 2.9 mi |
| 94590 | Vallejo, CA | 3.6 mi |
| 94510 | Benicia, CA | 4 mi |
| 94503 | American Canyon, CA | 5 mi |
| 94525 | Crockett, CA | 5.7 mi |
| 94569 | Port Costa, CA | 5.7 mi |
| 94592 | Vallejo, CA | 6.3 mi |
| 94572 | Rodeo, CA | 7.4 mi |
| 94534 | Fairfield, CA | 8.9 mi |
| 94547 | Hercules, CA | 9 mi |
| 94559 | Napa, CA | 10.1 mi |
| 94564 | Pinole, CA | 10.3 mi |
Questions about 94591
What is the ZIP+4 code for 94591?
94591 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 94591, you need to look up a specific street address to get them.
What city is 94591?
94591 is assigned to Vallejo, California, in Solano 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.