ZIP Code 21811 — Berlin, MD
21811 is a standard (street delivery) ZIP code serving Berlin, Maryland, in Worcester 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 21811 at a glance
| ZIP code | 21811 |
|---|---|
| Primary city | Berlin |
| State | Maryland (MD) |
| County | Worcester FIPS 24047 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 24,377 |
| Coordinates | 38.319770, -75.220240 |
How ZIP+4 works in 21811
The four digits after the hyphen encode a delivery segment inside 21811. 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 21811 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 21811.
| ZIP | City | Distance |
|---|---|---|
| 21862 | Showell, MD | 5.3 mi |
| 21841 | Newark, MD | 6.6 mi |
| 21872 | Whaleyville, MD | 7.8 mi |
| 21813 | Bishopville, MD | 7.8 mi |
| 21842 | Ocean City, MD | 8.1 mi |
| 21874 | Willards, MD | 8.8 mi |
| 21850 | Pittsville, MD | 10.1 mi |
| 19975 | Selbyville, DE | 10.6 mi |
| 19945 | Frankford, DE | 12.7 mi |
| 21863 | Snow Hill, MD | 13.3 mi |
| 21849 | Parsonsburg, MD | 13.5 mi |
| 19944 | Fenwick Island, DE | 14 mi |
Questions about 21811
What is the ZIP+4 code for 21811?
21811 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 21811, you need to look up a specific street address to get them.
What city is 21811?
21811 is assigned to Berlin, Maryland, in Worcester 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.