ZIP Code 21864 — Stockton, MD
21864 is a standard (street delivery) ZIP code serving Stockton, 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 21864 at a glance
| ZIP code | 21864 |
|---|---|
| Primary city | Stockton |
| State | Maryland (MD) |
| County | Worcester FIPS 24047 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 606 |
| Coordinates | 38.043550, -75.405320 |
How ZIP+4 works in 21864
The four digits after the hyphen encode a delivery segment inside 21864. 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 21864 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 21864.
| ZIP | City | Distance |
|---|---|---|
| 23356 | Greenbackville, VA | 3.7 mi |
| 21829 | Girdletree, MD | 4 mi |
| 23395 | Horntown, VA | 5.6 mi |
| 23336 | Chincoteague Island, VA | 7.2 mi |
| 21851 | Pocomoke City, MD | 7.9 mi |
| 23337 | Wallops Island, VA | 8.3 mi |
| 23415 | New Church, VA | 8.5 mi |
| 21863 | Snow Hill, MD | 10.2 mi |
| 23303 | Atlantic, VA | 11.1 mi |
| 23416 | Oak Hall, VA | 11.2 mi |
| 23488 | Withams, VA | 12.7 mi |
| 23442 | Temperanceville, VA | 13.2 mi |
Questions about 21864
What is the ZIP+4 code for 21864?
21864 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 21864, you need to look up a specific street address to get them.
What city is 21864?
21864 is assigned to Stockton, 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.