ZIP Code 19121 — Philadelphia, PA
19121 is a standard (street delivery) ZIP code serving Philadelphia, Pennsylvania, in Philadelphia 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 19121 at a glance
| ZIP code | 19121 |
|---|---|
| Primary city | Philadelphia |
| State | Pennsylvania (PA) |
| County | Philadelphia FIPS 42101 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 41,574 |
| Coordinates | 39.982310, -75.179950 |
How ZIP+4 works in 19121
The four digits after the hyphen encode a delivery segment inside 19121. 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 19121 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 Philadelphia
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 19121.
| ZIP | City | Distance |
|---|---|---|
| 19130 | Philadelphia, PA | 1 mi |
| 19132 | Philadelphia, PA | 1.1 mi |
| 19108 | Philadelphia, PA | 1.8 mi |
| 19122 | Philadelphia, PA | 1.8 mi |
| 19104 | Philadelphia, PA | 1.9 mi |
| 19103 | Philadelphia, PA | 2 mi |
| 19131 | Philadelphia, PA | 2.1 mi |
| 19133 | Philadelphia, PA | 2.1 mi |
| 19123 | Philadelphia, PA | 2.2 mi |
| 19129 | Philadelphia, PA | 2.2 mi |
| 19102 | Philadelphia, PA | 2.2 mi |
| 19109 | Philadelphia, PA | 2.4 mi |
Questions about 19121
What is the ZIP+4 code for 19121?
19121 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 19121, you need to look up a specific street address to get them.
What city is 19121?
19121 is assigned to Philadelphia, Pennsylvania, in Philadelphia 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.