ZIP Code 94571 — Rio Vista, CA
94571 is a standard (street delivery) ZIP code serving Rio Vista, 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 94571 at a glance
| ZIP code | 94571 |
|---|---|
| Primary city | Rio Vista |
| State | California (CA) |
| County | Solano FIPS 06095 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 10,974 |
| Coordinates | 38.156600, -121.748200 |
How ZIP+4 works in 94571
The four digits after the hyphen encode a delivery segment inside 94571. 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 94571 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 94571.
| ZIP | City | Distance |
|---|---|---|
| 94512 | Birds Landing, CA | 5.3 mi |
| 95641 | Isleton, CA | 7.9 mi |
| 95690 | Walnut Grove, CA | 10.3 mi |
| 94511 | Bethel Island, CA | 10.6 mi |
| 94585 | Suisun City, CA | 10.8 mi |
| 95680 | Ryde, CA | 10.9 mi |
| 94561 | Oakley, CA | 11.7 mi |
| 94509 | Antioch, CA | 11.9 mi |
| 94535 | Travis Afb, CA | 13 mi |
| 94548 | Knightsen, CA | 13.6 mi |
| 94531 | Antioch, CA | 13.9 mi |
| 94565 | Pittsburg, CA | 14.1 mi |
Questions about 94571
What is the ZIP+4 code for 94571?
94571 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 94571, you need to look up a specific street address to get them.
What city is 94571?
94571 is assigned to Rio Vista, 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.