ZIP Code 03580 — Franconia, NH
03580 is a standard (street delivery) ZIP code serving Franconia, New Hampshire, in Grafton 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 03580 at a glance
| ZIP code | 03580 |
|---|---|
| Primary city | Franconia |
| State | New Hampshire (NH) |
| County | Grafton FIPS 33009 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,402 |
| Coordinates | 44.173470, -71.695190 |
How ZIP+4 works in 03580
The four digits after the hyphen encode a delivery segment inside 03580. 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 03580 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 03580.
| ZIP | City | Distance |
|---|---|---|
| 03586 | Sugar Hill, NH | 6 mi |
| 03251 | Lincoln, NH | 6.8 mi |
| 03574 | Bethlehem, NH | 7.3 mi |
| 03585 | Lisbon, NH | 10.6 mi |
| 03785 | Woodsville, NH | 11.4 mi |
| 03262 | North Woodstock, NH | 12.2 mi |
| 03561 | Littleton, NH | 12.3 mi |
| 03595 | Twin Mountain, NH | 12.4 mi |
| 03293 | Woodstock, NH | 13.6 mi |
| 03215 | Waterville Valley, NH | 14.2 mi |
| 03740 | Bath, NH | 14.4 mi |
| 03598 | Whitefield, NH | 14.6 mi |
Questions about 03580
What is the ZIP+4 code for 03580?
03580 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 03580, you need to look up a specific street address to get them.
What city is 03580?
03580 is assigned to Franconia, New Hampshire, in Grafton 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.