ZIP Code 03781 — Plainfield, NH
03781 is a standard (street delivery) ZIP code serving Plainfield, New Hampshire, in Sullivan 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 03781 at a glance
| ZIP code | 03781 |
|---|---|
| Primary city | Plainfield |
| State | New Hampshire (NH) |
| County | Sullivan FIPS 33019 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,918 |
| Coordinates | 43.552600, -72.283990 |
How ZIP+4 works in 03781
The four digits after the hyphen encode a delivery segment inside 03781. 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 03781 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 03781.
| ZIP | City | Distance |
|---|---|---|
| 03770 | Meriden, NH | 1.6 mi |
| 05052 | North Hartland, VT | 4.9 mi |
| 03745 | Cornish, NH | 5.7 mi |
| 03784 | West Lebanon, NH | 5.9 mi |
| 03766 | Lebanon, NH | 6.1 mi |
| 05009 | White River Junction, VT | 7.2 mi |
| 03753 | Grantham, NH | 7.3 mi |
| 05048 | Hartland, VT | 7.4 mi |
| 05088 | Wilder, VT | 8.4 mi |
| 03748 | Enfield, NH | 9 mi |
| 05089 | Windsor, VT | 9.2 mi |
| 05059 | Quechee, VT | 9.6 mi |
Questions about 03781
What is the ZIP+4 code for 03781?
03781 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 03781, you need to look up a specific street address to get them.
What city is 03781?
03781 is assigned to Plainfield, New Hampshire, in Sullivan 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.