ZIP Code 18079 — Slatedale, PA
18079 is a standard (street delivery) ZIP code serving Slatedale, Pennsylvania, in Lehigh 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 18079 at a glance
| ZIP code | 18079 |
|---|---|
| Primary city | Slatedale |
| State | Pennsylvania (PA) |
| County | Lehigh FIPS 42077 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 303 |
| Coordinates | 40.744150, -75.657540 |
How ZIP+4 works in 18079
The four digits after the hyphen encode a delivery segment inside 18079. 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 18079 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 18079.
| ZIP | City | Distance |
|---|---|---|
| 18080 | Slatington, PA | 1.4 mi |
| 18053 | Germansville, PA | 3.3 mi |
| 18212 | Ashfield, PA | 3.8 mi |
| 18065 | Neffs, PA | 4 mi |
| 18030 | Bowmanstown, PA | 4.1 mi |
| 18078 | Schnecksville, PA | 5.3 mi |
| 18088 | Walnutport, PA | 5.4 mi |
| 18244 | Parryville, PA | 5.5 mi |
| 18012 | Aquashicola, PA | 5.8 mi |
| 18086 | Treichlers, PA | 5.8 mi |
| 18035 | Cherryville, PA | 6.1 mi |
| 18059 | Laurys Station, PA | 6.5 mi |
Questions about 18079
What is the ZIP+4 code for 18079?
18079 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 18079, you need to look up a specific street address to get them.
What city is 18079?
18079 is assigned to Slatedale, Pennsylvania, in Lehigh 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.