ZIP Code 21620 — Chestertown, MD
21620 is a standard (street delivery) ZIP code serving Chestertown, Maryland, in Kent 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 21620 at a glance
| ZIP code | 21620 |
|---|---|
| Primary city | Chestertown |
| State | Maryland (MD) |
| County | Kent FIPS 24029 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 13,810 |
| Coordinates | 39.206670, -76.087390 |
How ZIP+4 works in 21620
The four digits after the hyphen encode a delivery segment inside 21620. 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 21620 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 21620.
| ZIP | City | Distance |
|---|---|---|
| 21678 | Worton, MD | 7.1 mi |
| 21661 | Rock Hall, MD | 8.9 mi |
| 21628 | Crumpton, MD | 9 mi |
| 21623 | Church Hill, MD | 9 mi |
| 21667 | Still Pond, MD | 9.6 mi |
| 21645 | Kennedyville, MD | 10.3 mi |
| 21610 | Betterton, MD | 11 mi |
| 21617 | Centreville, MD | 11.1 mi |
| 21668 | Sudlersville, MD | 12.7 mi |
| 21651 | Millington, MD | 12.8 mi |
| 21644 | Ingleside, MD | 13 mi |
| 21607 | Barclay, MD | 13.3 mi |
Questions about 21620
What is the ZIP+4 code for 21620?
21620 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 21620, you need to look up a specific street address to get them.
What city is 21620?
21620 is assigned to Chestertown, Maryland, in Kent 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.