ZIP Code 17509 — Christiana, PA
17509 is a standard (street delivery) ZIP code serving Christiana, Pennsylvania, in Lancaster 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 17509 at a glance
| ZIP code | 17509 |
|---|---|
| Primary city | Christiana |
| State | Pennsylvania (PA) |
| County | Lancaster FIPS 42071 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 5,135 |
| Coordinates | 39.909230, -76.030730 |
How ZIP+4 works in 17509
The four digits after the hyphen encode a delivery segment inside 17509. 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 17509 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 17509.
| ZIP | City | Distance |
|---|---|---|
| 19310 | Atglen, PA | 3.6 mi |
| 17536 | Kirkwood, PA | 5.1 mi |
| 17562 | Paradise, PA | 5.7 mi |
| 19330 | Cochranville, PA | 6.5 mi |
| 19365 | Parkesburg, PA | 6.7 mi |
| 17566 | Quarryville, PA | 6.8 mi |
| 17535 | Kinzers, PA | 7.1 mi |
| 17527 | Gap, PA | 7.6 mi |
| 17579 | Strasburg, PA | 8.6 mi |
| 19367 | Pomeroy, PA | 8.6 mi |
| 19369 | Sadsburyville, PA | 8.7 mi |
| 19363 | Oxford, PA | 9 mi |
Questions about 17509
What is the ZIP+4 code for 17509?
17509 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 17509, you need to look up a specific street address to get them.
What city is 17509?
17509 is assigned to Christiana, Pennsylvania, in Lancaster 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.