ZIP Code 21781 — Saint James, MD
21781 is a standard (street delivery) ZIP code serving Saint James, Maryland, in Washington 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 21781 at a glance
| ZIP code | 21781 |
|---|---|
| Primary city | Saint James |
| State | Maryland (MD) |
| County | Washington FIPS 24043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 25 |
| Coordinates | 39.571230, -77.759810 |
How ZIP+4 works in 21781
The four digits after the hyphen encode a delivery segment inside 21781. 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 21781 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 21781.
| ZIP | City | Distance |
|---|---|---|
| 21733 | Fairplay, MD | 1.5 mi |
| 21746 | Hagerstown, MD | 2.5 mi |
| 21795 | Williamsport, MD | 3.7 mi |
| 21734 | Funkstown, MD | 3.8 mi |
| 21740 | Hagerstown, MD | 4.4 mi |
| 21713 | Boonsboro, MD | 5.7 mi |
| 25419 | Falling Waters, WV | 6.7 mi |
| 21782 | Sharpsburg, MD | 8 mi |
| 21756 | Keedysville, MD | 8.4 mi |
| 21767 | Maugansville, MD | 8.8 mi |
| 21742 | Hagerstown, MD | 8.9 mi |
| 25404 | Martinsburg, WV | 9.4 mi |
Questions about 21781
What is the ZIP+4 code for 21781?
21781 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 21781, you need to look up a specific street address to get them.
What city is 21781?
21781 is assigned to Saint James, Maryland, in Washington 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.