ZIP Code 20240 — Washington, DC
20240 is a standard (street delivery) ZIP code serving Washington, District of Columbia, in District of Columbia 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 20240 at a glance
| ZIP code | 20240 |
|---|---|
| Primary city | Washington |
| State | District of Columbia (DC) |
| County | District of Columbia FIPS 11001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Coordinates | 38.894460, -77.042610 |
How ZIP+4 works in 20240
The four digits after the hyphen encode a delivery segment inside 20240. 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 20240 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.
Other ZIP codes in Washington
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 20240.
| ZIP | City | Distance |
|---|---|---|
| 20245 | Washington, DC | 0.1 mi |
| 20415 | Washington, DC | 0.1 mi |
| 20551 | Washington, DC | 0.2 mi |
| 20006 | Washington, DC | 0.3 mi |
| 20418 | Washington, DC | 0.3 mi |
| 20431 | Washington, DC | 0.3 mi |
| 20520 | Washington, DC | 0.3 mi |
| 20052 | Washington, DC | 0.4 mi |
| 20230 | Washington, DC | 0.4 mi |
| 20220 | Washington, DC | 0.5 mi |
| 20427 | Washington, DC | 0.6 mi |
| 20037 | Washington, DC | 0.6 mi |
Questions about 20240
What is the ZIP+4 code for 20240?
20240 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 20240, you need to look up a specific street address to get them.
What city is 20240?
20240 is assigned to Washington, District of Columbia, in District of Columbia 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.