ZIP Code 19973 — Seaford, DE
19973 is a standard (street delivery) ZIP code serving Seaford, Delaware, in Sussex 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 19973 at a glance
| ZIP code | 19973 |
|---|---|
| Primary city | Seaford |
| State | Delaware (DE) |
| County | Sussex FIPS 10005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 26,834 |
| Coordinates | 38.634040, -75.624540 |
How ZIP+4 works in 19973
The four digits after the hyphen encode a delivery segment inside 19973. 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 19973 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 19973.
| ZIP | City | Distance |
|---|---|---|
| 19931 | Bethel, DE | 4.5 mi |
| 19933 | Bridgeville, DE | 7.2 mi |
| 19956 | Laurel, DE | 7.6 mi |
| 21861 | Sharptown, MD | 8.8 mi |
| 21632 | Federalsburg, MD | 10.2 mi |
| 21659 | Rhodesdale, MD | 10.3 mi |
| 19940 | Delmar, DE | 11.2 mi |
| 19947 | Georgetown, DE | 12.5 mi |
| 19950 | Greenwood, DE | 12.9 mi |
| 21643 | Hurlock, MD | 13.3 mi |
| 21875 | Delmar, MD | 14 mi |
| 21837 | Mardela Springs, MD | 14.3 mi |
Questions about 19973
What is the ZIP+4 code for 19973?
19973 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 19973, you need to look up a specific street address to get them.
What city is 19973?
19973 is assigned to Seaford, Delaware, in Sussex 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.