ZIP Code 17821 — Danville, PA
17821 is a standard (street delivery) ZIP code serving Danville, Pennsylvania, in Montour 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 17821 at a glance
| ZIP code | 17821 |
|---|---|
| Primary city | Danville |
| State | Pennsylvania (PA) |
| County | Montour FIPS 42093 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 18,613 |
| Coordinates | 40.991700, -76.639590 |
How ZIP+4 works in 17821
The four digits after the hyphen encode a delivery segment inside 17821. 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 17821 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 Danville
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 17821.
| ZIP | City | Distance |
|---|---|---|
| 17868 | Riverside, PA | 2.5 mi |
| 17822 | Danville, PA | 2.5 mi |
| 17884 | Washingtonville, PA | 4.6 mi |
| 17865 | Potts Grove, PA | 7.8 mi |
| 17857 | Northumberland, PA | 8 mi |
| 17847 | Milton, PA | 8.7 mi |
| 17772 | Turbotville, PA | 9.6 mi |
| 17749 | Mcewensville, PA | 10.6 mi |
| 17815 | Bloomsburg, PA | 11.1 mi |
| 17860 | Paxinos, PA | 11.4 mi |
| 17850 | Montandon, PA | 11.5 mi |
| 17824 | Elysburg, PA | 11.9 mi |
Questions about 17821
What is the ZIP+4 code for 17821?
17821 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 17821, you need to look up a specific street address to get them.
What city is 17821?
17821 is assigned to Danville, Pennsylvania, in Montour 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.