ZIP Code 18037 — Coplay, PA
18037 is a standard (street delivery) ZIP code serving Coplay, 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 18037 at a glance
| ZIP code | 18037 |
|---|---|
| Primary city | Coplay |
| State | Pennsylvania (PA) |
| County | Lehigh FIPS 42077 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 7,472 |
| Coordinates | 40.682030, -75.546380 |
How ZIP+4 works in 18037
The four digits after the hyphen encode a delivery segment inside 18037. 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 18037 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 18037.
| ZIP | City | Distance |
|---|---|---|
| 18052 | Whitehall, PA | 2.8 mi |
| 18059 | Laurys Station, PA | 2.9 mi |
| 18065 | Neffs, PA | 3.6 mi |
| 18086 | Treichlers, PA | 3.9 mi |
| 18078 | Schnecksville, PA | 4 mi |
| 18067 | Northampton, PA | 4.3 mi |
| 18032 | Catasauqua, PA | 4.5 mi |
| 18035 | Cherryville, PA | 4.7 mi |
| 18104 | Allentown, PA | 4.9 mi |
| 18069 | Orefield, PA | 5.3 mi |
| 18080 | Slatington, PA | 5.8 mi |
| 18088 | Walnutport, PA | 5.8 mi |
Questions about 18037
What is the ZIP+4 code for 18037?
18037 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 18037, you need to look up a specific street address to get them.
What city is 18037?
18037 is assigned to Coplay, 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.