ZIP Code 22031 — Fairfax, VA
22031 is a standard (street delivery) ZIP code serving Fairfax, Virginia, in Fairfax 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 22031 at a glance
| ZIP code | 22031 |
|---|---|
| Primary city | Fairfax |
| State | Virginia (VA) |
| County | Fairfax FIPS 51059 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 37,276 |
| Coordinates | 38.859540, -77.259900 |
How ZIP+4 works in 22031
The four digits after the hyphen encode a delivery segment inside 22031. 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 22031 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 Fairfax
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 22031.
| ZIP | City | Distance |
|---|---|---|
| 22180 | Vienna, VA | 2.5 mi |
| 22027 | Dunn Loring, VA | 3.2 mi |
| 22003 | Annandale, VA | 3.2 mi |
| 22032 | Fairfax, VA | 3.2 mi |
| 22042 | Falls Church, VA | 3.6 mi |
| 22181 | Vienna, VA | 3.7 mi |
| 22043 | Falls Church, VA | 4.4 mi |
| 22124 | Oakton, VA | 4.4 mi |
| 22030 | Fairfax, VA | 4.6 mi |
| 22046 | Falls Church, VA | 4.7 mi |
| 22151 | Springfield, VA | 4.8 mi |
| 22015 | Burke, VA | 5.1 mi |
Questions about 22031
What is the ZIP+4 code for 22031?
22031 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 22031, you need to look up a specific street address to get them.
What city is 22031?
22031 is assigned to Fairfax, Virginia, in Fairfax 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.