ZIP Code 91945 — Lemon Grove, CA
91945 is a standard (street delivery) ZIP code serving Lemon Grove, 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 91945 at a glance
| ZIP code | 91945 |
|---|---|
| Primary city | Lemon Grove |
| State | California (CA) |
| County | San Diego FIPS 06073 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 27,745 |
| Coordinates | 32.733150, -117.034020 |
How ZIP+4 works in 91945
The four digits after the hyphen encode a delivery segment inside 91945. 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 91945 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 91945.
| ZIP | City | Distance |
|---|---|---|
| 92114 | San Diego, CA | 2.1 mi |
| 91977 | Spring Valley, CA | 2.3 mi |
| 92115 | San Diego, CA | 2.9 mi |
| 91941 | La Mesa, CA | 3 mi |
| 91942 | La Mesa, CA | 3.1 mi |
| 92105 | San Diego, CA | 3.4 mi |
| 92182 | San Diego, CA | 3.7 mi |
| 92139 | San Diego, CA | 3.8 mi |
| 91902 | Bonita, CA | 4.4 mi |
| 92120 | San Diego, CA | 4.9 mi |
| 92102 | San Diego, CA | 5 mi |
| 92119 | San Diego, CA | 5.2 mi |
Questions about 91945
What is the ZIP+4 code for 91945?
91945 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 91945, you need to look up a specific street address to get them.
What city is 91945?
91945 is assigned to Lemon Grove, 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.
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.