ZIP Code 21920 — Elk Mills, MD
21920 is a standard (street delivery) ZIP code serving Elk Mills, Maryland, in Cecil 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 21920 at a glance
| ZIP code | 21920 |
|---|---|
| Primary city | Elk Mills |
| State | Maryland (MD) |
| County | Cecil FIPS 24015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,413 |
| Coordinates | 39.656750, -75.834490 |
How ZIP+4 works in 21920
The four digits after the hyphen encode a delivery segment inside 21920. 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 21920 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 21920.
| ZIP | City | Distance |
|---|---|---|
| 21921 | Elkton, MD | 2.5 mi |
| 19717 | Newark, DE | 4.6 mi |
| 19716 | Newark, DE | 4.8 mi |
| 19702 | Newark, DE | 6.1 mi |
| 19711 | Newark, DE | 6.4 mi |
| 19713 | Newark, DE | 6.7 mi |
| 19350 | Landenberg, PA | 7.6 mi |
| 21901 | North East, MD | 8.2 mi |
| 19701 | Bear, DE | 8.8 mi |
| 19352 | Lincoln University, PA | 9 mi |
| 21914 | Charlestown, MD | 9.7 mi |
| 19808 | Wilmington, DE | 10.6 mi |
Questions about 21920
What is the ZIP+4 code for 21920?
21920 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 21920, you need to look up a specific street address to get them.
What city is 21920?
21920 is assigned to Elk Mills, Maryland, in Cecil 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.