ZIP Code 21779 — Rohrersville, MD
21779 is a standard (street delivery) ZIP code serving Rohrersville, 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 21779 at a glance
| ZIP code | 21779 |
|---|---|
| Primary city | Rohrersville |
| State | Maryland (MD) |
| County | Washington FIPS 24043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,311 |
| Coordinates | 39.424470, -77.653980 |
How ZIP+4 works in 21779
The four digits after the hyphen encode a delivery segment inside 21779. 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 21779 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 21779.
| ZIP | City | Distance |
|---|---|---|
| 21718 | Burkittsville, MD | 2.6 mi |
| 21715 | Brownsville, MD | 3.2 mi |
| 21756 | Keedysville, MD | 3.4 mi |
| 21769 | Middletown, MD | 5 mi |
| 21758 | Knoxville, MD | 5.5 mi |
| 21782 | Sharpsburg, MD | 6 mi |
| 21755 | Jefferson, MD | 6.3 mi |
| 21713 | Boonsboro, MD | 7.1 mi |
| 21716 | Brunswick, MD | 7.5 mi |
| 21714 | Braddock Heights, MD | 7.7 mi |
| 25443 | Shepherdstown, WV | 8.6 mi |
| 21773 | Myersville, MD | 9.5 mi |
Questions about 21779
What is the ZIP+4 code for 21779?
21779 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 21779, you need to look up a specific street address to get them.
What city is 21779?
21779 is assigned to Rohrersville, 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.