ZIP Code 21108 — Millersville, MD
21108 is a standard (street delivery) ZIP code serving Millersville, Maryland, in Anne Arundel 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 21108 at a glance
| ZIP code | 21108 |
|---|---|
| Primary city | Millersville |
| State | Maryland (MD) |
| County | Anne Arundel FIPS 24003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 18,643 |
| Coordinates | 39.089320, -76.621390 |
How ZIP+4 works in 21108
The four digits after the hyphen encode a delivery segment inside 21108. 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 21108 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 21108.
| ZIP | City | Distance |
|---|---|---|
| 21146 | Severna Park, MD | 3.6 mi |
| 21144 | Severn, MD | 3.7 mi |
| 21032 | Crownsville, MD | 3.9 mi |
| 21061 | Glen Burnie, MD | 5 mi |
| 21054 | Gambrills, MD | 5.1 mi |
| 21113 | Odenton, MD | 5.6 mi |
| 21405 | Annapolis, MD | 5.6 mi |
| 21060 | Glen Burnie, MD | 5.9 mi |
| 21077 | Harmans, MD | 6.3 mi |
| 21114 | Crofton, MD | 6.4 mi |
| 21240 | Baltimore, MD | 6.5 mi |
| 20755 | Fort George G Meade, MD | 6.6 mi |
Questions about 21108
What is the ZIP+4 code for 21108?
21108 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 21108, you need to look up a specific street address to get them.
What city is 21108?
21108 is assigned to Millersville, Maryland, in Anne Arundel 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.