ZIP Code 17120 — Harrisburg, PA
17120 is a standard (street delivery) ZIP code serving Harrisburg, Pennsylvania, in Dauphin 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 17120 at a glance
| ZIP code | 17120 |
|---|---|
| Primary city | Harrisburg |
| State | Pennsylvania (PA) |
| County | Dauphin FIPS 42043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Coordinates | 40.265110, -76.882810 |
How ZIP+4 works in 17120
The four digits after the hyphen encode a delivery segment inside 17120. 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 17120 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 Harrisburg
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 17120.
| ZIP | City | Distance |
|---|---|---|
| 17101 | Harrisburg, PA | 0.4 mi |
| 17102 | Harrisburg, PA | 0.9 mi |
| 17103 | Harrisburg, PA | 1.2 mi |
| 17043 | Lemoyne, PA | 1.6 mi |
| 17104 | Harrisburg, PA | 2.5 mi |
| 17011 | Camp Hill, PA | 3.2 mi |
| 17109 | Harrisburg, PA | 3.5 mi |
| 17110 | Harrisburg, PA | 3.6 mi |
| 17093 | Summerdale, PA | 3.9 mi |
| 17113 | Harrisburg, PA | 4.1 mi |
| 17070 | New Cumberland, PA | 4.5 mi |
| 17111 | Harrisburg, PA | 5.3 mi |
Questions about 17120
What is the ZIP+4 code for 17120?
17120 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 17120, you need to look up a specific street address to get them.
What city is 17120?
17120 is assigned to Harrisburg, Pennsylvania, in Dauphin 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.