ZIP Code 20621 — Chaptico, MD
20621 is a standard (street delivery) ZIP code serving Chaptico, Maryland, in St. Mary's 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 20621 at a glance
| ZIP code | 20621 |
|---|---|
| Primary city | Chaptico |
| State | Maryland (MD) |
| County | St. Mary's FIPS 24037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 958 |
| Coordinates | 38.330620, -76.794380 |
How ZIP+4 works in 20621
The four digits after the hyphen encode a delivery segment inside 20621. 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 20621 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 20621.
| ZIP | City | Distance |
|---|---|---|
| 20624 | Clements, MD | 3.3 mi |
| 20618 | Bushwood, MD | 3.4 mi |
| 20609 | Avenue, MD | 4.8 mi |
| 20661 | Mount Victoria, MD | 5.3 mi |
| 20660 | Morganza, MD | 5.4 mi |
| 20625 | Cobb Island, MD | 5.6 mi |
| 20606 | Abell, MD | 6.1 mi |
| 20656 | Loveville, MD | 6.3 mi |
| 20664 | Newburg, MD | 6.7 mi |
| 20645 | Issue, MD | 6.9 mi |
| 20626 | Coltons Point, MD | 7 mi |
| 20659 | Mechanicsville, MD | 7 mi |
Questions about 20621
What is the ZIP+4 code for 20621?
20621 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 20621, you need to look up a specific street address to get them.
What city is 20621?
20621 is assigned to Chaptico, Maryland, in St. Mary's 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.