ZIP Code 03445 — Sullivan, NH
03445 is a standard (street delivery) ZIP code serving Sullivan, 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 03445 at a glance
| ZIP code | 03445 |
|---|---|
| Primary city | Sullivan |
| State | New Hampshire (NH) |
| County | Cheshire FIPS 33005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 687 |
| Coordinates | 43.015550, -72.213700 |
How ZIP+4 works in 03445
The four digits after the hyphen encode a delivery segment inside 03445. 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 03445 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 03445.
| ZIP | City | Distance |
|---|---|---|
| 03448 | Gilsum, NH | 3.1 mi |
| 03457 | Nelson, NH | 4.3 mi |
| 03431 | Keene, NH | 5.4 mi |
| 03464 | Stoddard, NH | 7 mi |
| 03456 | Marlow, NH | 8 mi |
| 03450 | Harrisville, NH | 8 mi |
| 03455 | Marlborough, NH | 8.2 mi |
| 03602 | Alstead, NH | 10.2 mi |
| 03608 | Walpole, NH | 10.4 mi |
| 03444 | Dublin, NH | 11 mi |
| 03449 | Hancock, NH | 11 mi |
| 03446 | Swanzey, NH | 11.4 mi |
Questions about 03445
What is the ZIP+4 code for 03445?
03445 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 03445, you need to look up a specific street address to get them.
What city is 03445?
03445 is assigned to Sullivan, 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.