ZIP Code 03257 — New London, NH
03257 is a standard (street delivery) ZIP code serving New London, New Hampshire, in Merrimack 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 03257 at a glance
| ZIP code | 03257 |
|---|---|
| Primary city | New London |
| State | New Hampshire (NH) |
| County | Merrimack FIPS 33013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 4,484 |
| Coordinates | 43.417680, -71.991010 |
How ZIP+4 works in 03257
The four digits after the hyphen encode a delivery segment inside 03257. 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 03257 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 03257.
| ZIP | City | Distance |
|---|---|---|
| 03233 | Elkins, NH | 2.9 mi |
| 03287 | Wilmot, NH | 4.3 mi |
| 03751 | Georges Mills, NH | 5 mi |
| 03260 | North Sutton, NH | 5.2 mi |
| 03782 | Sunapee, NH | 5.4 mi |
| 03284 | Springfield, NH | 5.6 mi |
| 03255 | Newbury, NH | 7.3 mi |
| 03273 | South Sutton, NH | 8.6 mi |
| 03230 | Danbury, NH | 9.9 mi |
| 03216 | Andover, NH | 10.1 mi |
| 03753 | Grantham, NH | 10.4 mi |
| 03773 | Newport, NH | 10.7 mi |
Questions about 03257
What is the ZIP+4 code for 03257?
03257 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 03257, you need to look up a specific street address to get them.
What city is 03257?
03257 is assigned to New London, New Hampshire, in Merrimack 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.