ZIP Code 19720 — New Castle, DE
19720 is a standard (street delivery) ZIP code serving New Castle, 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 19720 at a glance
| ZIP code | 19720 |
|---|---|
| Primary city | New Castle |
| State | Delaware (DE) |
| County | New Castle FIPS 10003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 62,392 |
| Coordinates | 39.645000, -75.606780 |
How ZIP+4 works in 19720
The four digits after the hyphen encode a delivery segment inside 19720. 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 19720 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 19720.
| ZIP | City | Distance |
|---|---|---|
| 19804 | Wilmington, DE | 5 mi |
| 19706 | Delaware City, DE | 5.1 mi |
| 08070 | Pennsville, NJ | 5.4 mi |
| 19713 | Newark, DE | 5.8 mi |
| 19733 | Saint Georges, DE | 6.4 mi |
| 19701 | Bear, DE | 6.5 mi |
| 08023 | Deepwater, NJ | 6.5 mi |
| 19702 | Newark, DE | 6.6 mi |
| 19801 | Wilmington, DE | 6.6 mi |
| 19805 | Wilmington, DE | 7 mi |
| 19808 | Wilmington, DE | 7.1 mi |
| 19716 | Newark, DE | 7.6 mi |
Questions about 19720
What is the ZIP+4 code for 19720?
19720 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 19720, you need to look up a specific street address to get them.
What city is 19720?
19720 is assigned to New Castle, 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.