ZIP Code 03870 — Rye, NH
03870 is a standard (street delivery) ZIP code serving Rye, New Hampshire, in Rockingham 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 03870 at a glance
| ZIP code | 03870 |
|---|---|
| Primary city | Rye |
| State | New Hampshire (NH) |
| County | Rockingham FIPS 33015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 5,188 |
| Coordinates | 43.015700, -70.760520 |
How ZIP+4 works in 03870
The four digits after the hyphen encode a delivery segment inside 03870. 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 03870 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 03870.
| ZIP | City | Distance |
|---|---|---|
| 03871 | Rye Beach, NH | 2.5 mi |
| 03854 | New Castle, NH | 4 mi |
| 03862 | North Hampton, NH | 4.3 mi |
| 03801 | Portsmouth, NH | 4.5 mi |
| 03840 | Greenland, NH | 4.7 mi |
| 03905 | Kittery Point, ME | 6.1 mi |
| 03842 | Hampton, NH | 6.5 mi |
| 03904 | Kittery, ME | 6.7 mi |
| 03885 | Stratham, NH | 7.1 mi |
| 03844 | Hampton Falls, NH | 8.8 mi |
| 03903 | Eliot, ME | 9.3 mi |
| 03874 | Seabrook, NH | 10.2 mi |
Questions about 03870
What is the ZIP+4 code for 03870?
03870 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 03870, you need to look up a specific street address to get them.
What city is 03870?
03870 is assigned to Rye, New Hampshire, in Rockingham 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.