ZIP Code 21783 — Smithsburg, MD
21783 is a standard (street delivery) ZIP code serving Smithsburg, 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 21783 at a glance
| ZIP code | 21783 |
|---|---|
| Primary city | Smithsburg |
| State | Maryland (MD) |
| County | Washington FIPS 24043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 9,910 |
| Coordinates | 39.648850, -77.559030 |
How ZIP+4 works in 21783
The four digits after the hyphen encode a delivery segment inside 21783. 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 21783 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 21783.
| ZIP | City | Distance |
|---|---|---|
| 21719 | Cascade, MD | 5 mi |
| 21780 | Sabillasville, MD | 5.2 mi |
| 21742 | Hagerstown, MD | 5.6 mi |
| 17250 | Rouzerville, PA | 6.3 mi |
| 21773 | Myersville, MD | 7.7 mi |
| 21734 | Funkstown, MD | 8.2 mi |
| 17214 | Blue Ridge Summit, PA | 8.3 mi |
| 21788 | Thurmont, MD | 8.3 mi |
| 17268 | Waynesboro, PA | 8.7 mi |
| 21740 | Hagerstown, MD | 9.6 mi |
| 17263 | State Line, PA | 9.9 mi |
| 21746 | Hagerstown, MD | 10 mi |
Questions about 21783
What is the ZIP+4 code for 21783?
21783 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 21783, you need to look up a specific street address to get them.
What city is 21783?
21783 is assigned to Smithsburg, 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.