ZIP Code 17978 — Spring Glen, PA
17978 is a standard (street delivery) ZIP code serving Spring Glen, 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 17978 at a glance
| ZIP code | 17978 |
|---|---|
| Primary city | Spring Glen |
| State | Pennsylvania (PA) |
| County | Dauphin FIPS 42043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 688 |
| Coordinates | 40.616500, -76.652190 |
How ZIP+4 works in 17978
The four digits after the hyphen encode a delivery segment inside 17978. 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 17978 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 17978.
| ZIP | City | Distance |
|---|---|---|
| 17098 | Williamstown, PA | 2.1 mi |
| 17968 | Sacramento, PA | 2.2 mi |
| 17097 | Wiconisco, PA | 3.2 mi |
| 17048 | Lykens, PA | 4 mi |
| 17030 | Gratz, PA | 4.9 mi |
| 17941 | Klingerstown, PA | 5.2 mi |
| 17983 | Valley View, PA | 5.7 mi |
| 17980 | Tower City, PA | 6.1 mi |
| 17867 | Rebuck, PA | 7.1 mi |
| 17957 | Muir, PA | 7.3 mi |
| 17836 | Leck Kill, PA | 7.3 mi |
| 17080 | Pillow, PA | 8.1 mi |
Questions about 17978
What is the ZIP+4 code for 17978?
17978 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 17978, you need to look up a specific street address to get them.
What city is 17978?
17978 is assigned to Spring Glen, 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.