ZIP Code 19901 — Dover, DE
19901 is a standard (street delivery) ZIP code serving Dover, Delaware, in Kent 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 19901 at a glance
| ZIP code | 19901 |
|---|---|
| Primary city | Dover |
| State | Delaware (DE) |
| County | Kent FIPS 10001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 37,763 |
| Coordinates | 39.173350, -75.477580 |
How ZIP+4 works in 19901
The four digits after the hyphen encode a delivery segment inside 19901. 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 19901 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 Dover
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 19901.
| ZIP | City | Distance |
|---|---|---|
| 19902 | Dover Afb, DE | 3.2 mi |
| 19904 | Dover, DE | 6.3 mi |
| 19936 | Cheswold, DE | 6.5 mi |
| 19962 | Magnolia, DE | 7.2 mi |
| 19980 | Woodside, DE | 8.5 mi |
| 19977 | Smyrna, DE | 9.4 mi |
| 19946 | Frederica, DE | 9.8 mi |
| 19979 | Viola, DE | 10 mi |
| 19934 | Camden Wyoming, DE | 10.4 mi |
| 19955 | Kenton, DE | 10.7 mi |
| 19953 | Hartly, DE | 11.8 mi |
| 19938 | Clayton, DE | 13.2 mi |
Questions about 19901
What is the ZIP+4 code for 19901?
19901 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 19901, you need to look up a specific street address to get them.
What city is 19901?
19901 is assigned to Dover, Delaware, in Kent 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.