ZIP Code 18237 — Mcadoo, PA
18237 is a standard (street delivery) ZIP code serving Mcadoo, Pennsylvania, in Schuylkill 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 18237 at a glance
| ZIP code | 18237 |
|---|---|
| Primary city | Mcadoo |
| State | Pennsylvania (PA) |
| County | Schuylkill FIPS 42107 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 3,712 |
| Coordinates | 40.885910, -76.025820 |
How ZIP+4 works in 18237
The four digits after the hyphen encode a delivery segment inside 18237. 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 18237 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 18237.
| ZIP | City | Distance |
|---|---|---|
| 18231 | Kelayres, PA | 1.5 mi |
| 18245 | Quakake, PA | 2.3 mi |
| 18248 | Sheppton, PA | 3.7 mi |
| 18254 | Tresckow, PA | 3.8 mi |
| 18220 | Delano, PA | 4.1 mi |
| 18202 | Hazleton, PA | 4.5 mi |
| 18242 | Oneida, PA | 5.3 mi |
| 18230 | Junedale, PA | 5.5 mi |
| 18201 | Hazleton, PA | 5.9 mi |
| 18214 | Barnesville, PA | 6.2 mi |
| 18225 | Harleigh, PA | 7.2 mi |
| 18218 | Coaldale, PA | 7.3 mi |
Questions about 18237
What is the ZIP+4 code for 18237?
18237 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 18237, you need to look up a specific street address to get them.
What city is 18237?
18237 is assigned to Mcadoo, Pennsylvania, in Schuylkill 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.