ZIP Code 21550 — Oakland, MD
21550 is a standard (street delivery) ZIP code serving Oakland, Maryland, in Garrett 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 21550 at a glance
| ZIP code | 21550 |
|---|---|
| Primary city | Oakland |
| State | Maryland (MD) |
| County | Garrett FIPS 24023 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 13,691 |
| Coordinates | 39.391070, -79.390850 |
How ZIP+4 works in 21550
The four digits after the hyphen encode a delivery segment inside 21550. 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 21550 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 21550.
| ZIP | City | Distance |
|---|---|---|
| 26720 | Gormania, WV | 8.4 mi |
| 21538 | Kitzmiller, MD | 9.1 mi |
| 26764 | Terra Alta, WV | 9.9 mi |
| 26705 | Aurora, WV | 10.5 mi |
| 26716 | Eglon, WV | 11.1 mi |
| 21541 | Mchenry, MD | 11.5 mi |
| 26707 | Bayard, WV | 11.6 mi |
| 26717 | Elk Garden, WV | 11.9 mi |
| 21561 | Swanton, MD | 12.4 mi |
| 26739 | Mount Storm, WV | 13.9 mi |
| 26425 | Rowlesburg, WV | 16.7 mi |
| 26519 | Albright, WV | 17 mi |
Questions about 21550
What is the ZIP+4 code for 21550?
21550 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 21550, you need to look up a specific street address to get them.
What city is 21550?
21550 is assigned to Oakland, Maryland, in Garrett 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.