ZIP Code 19801 — Wilmington, DE
19801 is a standard (street delivery) ZIP code serving Wilmington, 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 19801 at a glance
| ZIP code | 19801 |
|---|---|
| Primary city | Wilmington |
| State | Delaware (DE) |
| County | New Castle FIPS 10003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 16,327 |
| Coordinates | 39.727820, -75.546150 |
How ZIP+4 works in 19801
The four digits after the hyphen encode a delivery segment inside 19801. 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 19801 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.
Other ZIP codes in Wilmington
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 19801.
| ZIP | City | Distance |
|---|---|---|
| 19802 | Wilmington, DE | 2.2 mi |
| 19806 | Wilmington, DE | 2.5 mi |
| 19805 | Wilmington, DE | 2.8 mi |
| 19809 | Wilmington, DE | 3.1 mi |
| 08023 | Deepwater, NJ | 3.8 mi |
| 19804 | Wilmington, DE | 4 mi |
| 19710 | Montchanin, DE | 4.7 mi |
| 19803 | Wilmington, DE | 4.9 mi |
| 19732 | Rockland, DE | 5.2 mi |
| 08069 | Penns Grove, NJ | 5.4 mi |
| 19807 | Wilmington, DE | 6 mi |
| 19735 | Winterthur, DE | 6.1 mi |
Questions about 19801
What is the ZIP+4 code for 19801?
19801 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 19801, you need to look up a specific street address to get them.
What city is 19801?
19801 is assigned to Wilmington, 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.