ZIP Code 17020 — Duncannon, PA
17020 is a standard (street delivery) ZIP code serving Duncannon, Pennsylvania, in Perry 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 17020 at a glance
| ZIP code | 17020 |
|---|---|
| Primary city | Duncannon |
| State | Pennsylvania (PA) |
| County | Perry FIPS 42099 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 8,826 |
| Coordinates | 40.410140, -77.043670 |
How ZIP+4 works in 17020
The four digits after the hyphen encode a delivery segment inside 17020. 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 17020 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 17020.
| ZIP | City | Distance |
|---|---|---|
| 17069 | New Buffalo, PA | 4.7 mi |
| 17053 | Marysville, PA | 5.9 mi |
| 17068 | New Bloomfield, PA | 7.1 mi |
| 17074 | Newport, PA | 7.2 mi |
| 17018 | Dauphin, PA | 8.6 mi |
| 17025 | Enola, PA | 8.7 mi |
| 17093 | Summerdale, PA | 9.2 mi |
| 17090 | Shermans Dale, PA | 9.2 mi |
| 17110 | Harrisburg, PA | 10.6 mi |
| 17050 | Mechanicsburg, PA | 11.1 mi |
| 17062 | Millerstown, PA | 11.7 mi |
| 17102 | Harrisburg, PA | 12.3 mi |
Questions about 17020
What is the ZIP+4 code for 17020?
17020 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 17020, you need to look up a specific street address to get them.
What city is 17020?
17020 is assigned to Duncannon, Pennsylvania, in Perry 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.