ZIP Code 19731 — Port Penn, DE
19731 is a standard (street delivery) ZIP code serving Port Penn, Delaware, in New Castle 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 19731 at a glance
| ZIP code | 19731 |
|---|---|
| Primary city | Port Penn |
| State | Delaware (DE) |
| County | New Castle FIPS 10003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 655 |
| Coordinates | 39.510200, -75.596160 |
How ZIP+4 works in 19731
The four digits after the hyphen encode a delivery segment inside 19731. 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 19731 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 19731.
| ZIP | City | Distance |
|---|---|---|
| 19706 | Delaware City, DE | 4.2 mi |
| 19733 | Saint Georges, DE | 4.5 mi |
| 19709 | Middletown, DE | 4.9 mi |
| 19730 | Odessa, DE | 5.2 mi |
| 08038 | Hancocks Bridge, NJ | 6.3 mi |
| 19701 | Bear, DE | 7.5 mi |
| 08079 | Salem, NJ | 9 mi |
| 19734 | Townsend, DE | 9.2 mi |
| 08070 | Pennsville, NJ | 9.2 mi |
| 19720 | New Castle, DE | 9.3 mi |
| 08072 | Quinton, NJ | 10.1 mi |
| 19702 | Newark, DE | 10.4 mi |
Questions about 19731
What is the ZIP+4 code for 19731?
19731 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 19731, you need to look up a specific street address to get them.
What city is 19731?
19731 is assigned to Port Penn, Delaware, in New Castle 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.