ZIP Code 20001 — Washington, DC
20001 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 20001 at a glance
| ZIP code | 20001 |
|---|---|
| Primary city | Washington |
| State | District of Columbia (DC) |
| County | District of Columbia FIPS 11001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 44,616 |
| Coordinates | 38.910020, -77.018000 |
How ZIP+4 works in 20001
The four digits after the hyphen encode a delivery segment inside 20001. 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 20001 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 20001.
| ZIP | City | Distance |
|---|---|---|
| 20005 | Washington, DC | 0.8 mi |
| 20059 | Washington, DC | 0.9 mi |
| 20004 | Washington, DC | 1.1 mi |
| 20535 | Washington, DC | 1.1 mi |
| 20045 | Washington, DC | 1.1 mi |
| 20530 | Washington, DC | 1.2 mi |
| 20009 | Washington, DC | 1.2 mi |
| 20408 | Washington, DC | 1.2 mi |
| 20036 | Washington, DC | 1.3 mi |
| 20220 | Washington, DC | 1.3 mi |
| 20510 | Washington, DC | 1.3 mi |
| 20422 | Washington, DC | 1.3 mi |
Questions about 20001
What is the ZIP+4 code for 20001?
20001 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 20001, you need to look up a specific street address to get them.
What city is 20001?
20001 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.