ZIP Code 08858 — Oldwick, NJ
08858 is a standard (street delivery) ZIP code serving Oldwick, New Jersey, in Hunterdon 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 08858 at a glance
| ZIP code | 08858 |
|---|---|
| Primary city | Oldwick |
| State | New Jersey (NJ) |
| County | Hunterdon FIPS 34019 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 20 |
| Coordinates | 40.679030, -74.737480 |
How ZIP+4 works in 08858
The four digits after the hyphen encode a delivery segment inside 08858. 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 08858 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 08858.
| ZIP | City | Distance |
|---|---|---|
| 07979 | Pottersville, NJ | 2.4 mi |
| 07921 | Bedminster, NJ | 3.5 mi |
| 07934 | Gladstone, NJ | 4.1 mi |
| 07830 | Califon, NJ | 4.4 mi |
| 07931 | Far Hills, NJ | 4.6 mi |
| 08833 | Lebanon, NJ | 4.9 mi |
| 07977 | Peapack, NJ | 5.1 mi |
| 08889 | Whitehouse Station, NJ | 5.1 mi |
| 08876 | Somerville, NJ | 6.7 mi |
| 07930 | Chester, NJ | 7.6 mi |
| 07853 | Long Valley, NJ | 7.9 mi |
| 08829 | High Bridge, NJ | 8.2 mi |
Questions about 08858
What is the ZIP+4 code for 08858?
08858 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 08858, you need to look up a specific street address to get them.
What city is 08858?
08858 is assigned to Oldwick, New Jersey, in Hunterdon 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.