ZIP Code 22821 — Dayton, VA
22821 is a standard (street delivery) ZIP code serving Dayton, Virginia, in Rockingham 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 22821 at a glance
| ZIP code | 22821 |
|---|---|
| Primary city | Dayton |
| State | Virginia (VA) |
| County | Rockingham FIPS 51165 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 6,116 |
| Coordinates | 38.463490, -79.074300 |
How ZIP+4 works in 22821
The four digits after the hyphen encode a delivery segment inside 22821. 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 22821 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 22821.
| ZIP | City | Distance |
|---|---|---|
| 22812 | Bridgewater, VA | 6.1 mi |
| 22831 | Hinton, VA | 7.1 mi |
| 22843 | Mount Solon, VA | 8.1 mi |
| 22850 | Singers Glen, VA | 10.9 mi |
| 22801 | Harrisonburg, VA | 11.3 mi |
| 22807 | Harrisonburg, VA | 11.4 mi |
| 22802 | Harrisonburg, VA | 11.9 mi |
| 22841 | Mount Crawford, VA | 13 mi |
| 22834 | Linville, VA | 13.4 mi |
| 26802 | Brandywine, WV | 13.9 mi |
| 24486 | Weyers Cave, VA | 14.1 mi |
| 22830 | Fulks Run, VA | 14.4 mi |
Questions about 22821
What is the ZIP+4 code for 22821?
22821 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 22821, you need to look up a specific street address to get them.
What city is 22821?
22821 is assigned to Dayton, Virginia, in Rockingham 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.