ZIP Code 03431 — Keene, NH
03431 is a standard (street delivery) ZIP code serving Keene, New Hampshire, in Cheshire 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 03431 at a glance
| ZIP code | 03431 |
|---|---|
| Primary city | Keene |
| State | New Hampshire (NH) |
| County | Cheshire FIPS 33005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 25,065 |
| Coordinates | 42.967850, -72.298620 |
How ZIP+4 works in 03431
The four digits after the hyphen encode a delivery segment inside 03431. 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 03431 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 03431.
| ZIP | City | Distance |
|---|---|---|
| 03448 | Gilsum, NH | 5.3 mi |
| 03445 | Sullivan, NH | 5.4 mi |
| 03467 | Westmoreland, NH | 6.7 mi |
| 03446 | Swanzey, NH | 7.3 mi |
| 03462 | Spofford, NH | 7.4 mi |
| 03455 | Marlborough, NH | 7.6 mi |
| 03457 | Nelson, NH | 8.9 mi |
| 03608 | Walpole, NH | 9 mi |
| 03443 | Chesterfield, NH | 10.4 mi |
| 03450 | Harrisville, NH | 10.6 mi |
| 03465 | Troy, NH | 11.2 mi |
| 03466 | West Chesterfield, NH | 11.8 mi |
Questions about 03431
What is the ZIP+4 code for 03431?
03431 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 03431, you need to look up a specific street address to get them.
What city is 03431?
03431 is assigned to Keene, New Hampshire, in Cheshire 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.