ZIP Code 21158 — Westminster, MD
21158 is a standard (street delivery) ZIP code serving Westminster, Maryland, in Carroll 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 21158 at a glance
| ZIP code | 21158 |
|---|---|
| Primary city | Westminster |
| State | Maryland (MD) |
| County | Carroll FIPS 24013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 22,083 |
| Coordinates | 39.646600, -77.032170 |
How ZIP+4 works in 21158
The four digits after the hyphen encode a delivery segment inside 21158. 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 21158 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.
Other ZIP codes in Westminster
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 21158.
| ZIP | City | Distance |
|---|---|---|
| 21157 | Westminster, MD | 7.3 mi |
| 21787 | Taneytown, MD | 7.7 mi |
| 17340 | Littlestown, PA | 8.6 mi |
| 21776 | New Windsor, MD | 9.6 mi |
| 21074 | Hampstead, MD | 10.2 mi |
| 17331 | Hanover, PA | 10.3 mi |
| 21102 | Manchester, MD | 10.3 mi |
| 21791 | Union Bridge, MD | 10.9 mi |
| 17344 | Mcsherrystown, PA | 11 mi |
| 21048 | Finksburg, MD | 12.3 mi |
| 17329 | Glenville, PA | 12.4 mi |
| 21757 | Keymar, MD | 12.5 mi |
Questions about 21158
What is the ZIP+4 code for 21158?
21158 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 21158, you need to look up a specific street address to get them.
What city is 21158?
21158 is assigned to Westminster, Maryland, in Carroll 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.