ZIP Code 19539 — Mertztown, PA
19539 is a standard (street delivery) ZIP code serving Mertztown, Pennsylvania, in Berks 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 19539 at a glance
| ZIP code | 19539 |
|---|---|
| Primary city | Mertztown |
| State | Pennsylvania (PA) |
| County | Berks FIPS 42011 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 3,823 |
| Coordinates | 40.490710, -75.688230 |
How ZIP+4 works in 19539
The four digits after the hyphen encode a delivery segment inside 19539. 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 19539 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 19539.
| ZIP | City | Distance |
|---|---|---|
| 19562 | Topton, PA | 1.1 mi |
| 18011 | Alburtis, PA | 2.6 mi |
| 19511 | Bowers, PA | 2.9 mi |
| 19536 | Lyon Station, PA | 3.8 mi |
| 19538 | Maxatawny, PA | 3.9 mi |
| 18031 | Breinigsville, PA | 4.7 mi |
| 19530 | Kutztown, PA | 5.8 mi |
| 18062 | Macungie, PA | 5.8 mi |
| 18087 | Trexlertown, PA | 6.5 mi |
| 18051 | Fogelsville, PA | 7.2 mi |
| 18195 | Allentown, PA | 7.3 mi |
| 19522 | Fleetwood, PA | 7.3 mi |
Questions about 19539
What is the ZIP+4 code for 19539?
19539 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 19539, you need to look up a specific street address to get them.
What city is 19539?
19539 is assigned to Mertztown, Pennsylvania, in Berks 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.