ZIP Code 03818 — Conway, NH
03818 is a standard (street delivery) ZIP code serving Conway, New Hampshire, in Carroll 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 03818 at a glance
| ZIP code | 03818 |
|---|---|
| Primary city | Conway |
| State | New Hampshire (NH) |
| County | Carroll FIPS 33003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 3,805 |
| Coordinates | 43.973020, -71.252610 |
How ZIP+4 works in 03818
The four digits after the hyphen encode a delivery segment inside 03818. 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 03818 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 03818.
| ZIP | City | Distance |
|---|---|---|
| 03897 | Wonalancet, NH | 5.7 mi |
| 03817 | Chocorua, NH | 5.9 mi |
| 03875 | Silver Lake, NH | 6 mi |
| 03886 | Tamworth, NH | 7.7 mi |
| 03812 | Bartlett, NH | 7.8 mi |
| 03860 | North Conway, NH | 8 mi |
| 03849 | Madison, NH | 8.1 mi |
| 03847 | Kearsarge, NH | 9.3 mi |
| 03838 | Glen, NH | 9.6 mi |
| 03845 | Intervale, NH | 10.9 mi |
| 03890 | West Ossipee, NH | 11.1 mi |
| 03832 | Eaton Center, NH | 11.2 mi |
Questions about 03818
What is the ZIP+4 code for 03818?
03818 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 03818, you need to look up a specific street address to get them.
What city is 03818?
03818 is assigned to Conway, New Hampshire, in Carroll 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.