ZIP Code 03230 — Danbury, NH
03230 is a standard (street delivery) ZIP code serving Danbury, 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 03230 at a glance
| ZIP code | 03230 |
|---|---|
| Primary city | Danbury |
| State | New Hampshire (NH) |
| County | Merrimack FIPS 33013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,451 |
| Coordinates | 43.526850, -71.862200 |
How ZIP+4 works in 03230
The four digits after the hyphen encode a delivery segment inside 03230. 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 03230 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 03230.
| ZIP | City | Distance |
|---|---|---|
| 03243 | Hill, NH | 4.9 mi |
| 03287 | Wilmot, NH | 5.9 mi |
| 03216 | Andover, NH | 6.5 mi |
| 03240 | Grafton, NH | 6.5 mi |
| 03231 | East Andover, NH | 7.3 mi |
| 03233 | Elkins, NH | 8 mi |
| 03222 | Bristol, NH | 8.1 mi |
| 03284 | Springfield, NH | 8.7 mi |
| 03257 | New London, NH | 9.9 mi |
| 03235 | Franklin, NH | 10.9 mi |
| 03268 | Salisbury, NH | 11.1 mi |
| 03260 | North Sutton, NH | 11.9 mi |
Questions about 03230
What is the ZIP+4 code for 03230?
03230 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 03230, you need to look up a specific street address to get them.
What city is 03230?
03230 is assigned to Danbury, 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.