ZIP Code 91910 — Chula Vista, CA
91910 is a standard (street delivery) ZIP code serving Chula Vista, California, in San Diego 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 91910 at a glance
| ZIP code | 91910 |
|---|---|
| Primary city | Chula Vista |
| State | California (CA) |
| County | San Diego FIPS 06073 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 77,123 |
| Coordinates | 32.636530, -117.063010 |
How ZIP+4 works in 91910
The four digits after the hyphen encode a delivery segment inside 91910. 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 91910 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 Chula Vista
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 91910.
| ZIP | City | Distance |
|---|---|---|
| 91911 | Chula Vista, CA | 2.2 mi |
| 91950 | National City, CA | 2.9 mi |
| 92139 | San Diego, CA | 3.1 mi |
| 91902 | Bonita, CA | 4.3 mi |
| 91913 | Chula Vista, CA | 4.6 mi |
| 92136 | San Diego, CA | 4.7 mi |
| 92114 | San Diego, CA | 4.9 mi |
| 92113 | San Diego, CA | 5.3 mi |
| 92173 | San Ysidro, CA | 5.6 mi |
| 91932 | Imperial Beach, CA | 5.6 mi |
| 92102 | San Diego, CA | 6.3 mi |
| 92155 | San Diego, CA | 6.5 mi |
Questions about 91910
What is the ZIP+4 code for 91910?
91910 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 91910, you need to look up a specific street address to get them.
What city is 91910?
91910 is assigned to Chula Vista, California, in San Diego 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.
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