ZIP Code 03057 — Mont Vernon, NH
03057 is a standard (street delivery) ZIP code serving Mont Vernon, New Hampshire, in Hillsborough 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 03057 at a glance
| ZIP code | 03057 |
|---|---|
| Primary city | Mont Vernon |
| State | New Hampshire (NH) |
| County | Hillsborough FIPS 33011 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,709 |
| Coordinates | 42.902650, -71.686100 |
How ZIP+4 works in 03057
The four digits after the hyphen encode a delivery segment inside 03057. 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 03057 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 03057.
| ZIP | City | Distance |
|---|---|---|
| 03082 | Lyndeborough, NH | 4.5 mi |
| 03031 | Amherst, NH | 4.6 mi |
| 03070 | New Boston, NH | 5.1 mi |
| 03055 | Milford, NH | 5.9 mi |
| 03086 | Wilton, NH | 6.7 mi |
| 03110 | Bedford, NH | 8.3 mi |
| 03054 | Merrimack, NH | 9.1 mi |
| 03043 | Francestown, NH | 9.2 mi |
| 03047 | Greenfield, NH | 9.7 mi |
| 03084 | Temple, NH | 9.9 mi |
| 03045 | Goffstown, NH | 10 mi |
| 03033 | Brookline, NH | 10.8 mi |
Questions about 03057
What is the ZIP+4 code for 03057?
03057 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 03057, you need to look up a specific street address to get them.
What city is 03057?
03057 is assigned to Mont Vernon, New Hampshire, in Hillsborough 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.