ZIP Code 21543 — Midlothian, MD
21543 is a standard (street delivery) ZIP code serving Midlothian, Maryland, in Allegany 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 21543 at a glance
| ZIP code | 21543 |
|---|---|
| Primary city | Midlothian |
| State | Maryland (MD) |
| County | Allegany FIPS 24001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 185 |
| Coordinates | 39.641570, -78.962310 |
How ZIP+4 works in 21543
The four digits after the hyphen encode a delivery segment inside 21543. 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 21543 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 21543.
| ZIP | City | Distance |
|---|---|---|
| 21532 | Frostburg, MD | 1 mi |
| 21542 | Midland, MD | 3.5 mi |
| 21539 | Lonaconing, MD | 3.9 mi |
| 21545 | Mount Savage, MD | 6.5 mi |
| 21521 | Barton, MD | 7.8 mi |
| 21557 | Rawlings, MD | 8.7 mi |
| 15564 | Wellersburg, PA | 8.7 mi |
| 21524 | Corriganville, MD | 9.6 mi |
| 15532 | Boynton, PA | 9.8 mi |
| 15558 | Salisbury, PA | 10.3 mi |
| 21562 | Westernport, MD | 10.6 mi |
| 26753 | Ridgeley, WV | 10.7 mi |
Questions about 21543
What is the ZIP+4 code for 21543?
21543 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 21543, you need to look up a specific street address to get them.
What city is 21543?
21543 is assigned to Midlothian, Maryland, in Allegany 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.