ZIP Code 07840 — Hackettstown, NJ
07840 is a standard (street delivery) ZIP code serving Hackettstown, New Jersey, in Warren 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 07840 at a glance
| ZIP code | 07840 |
|---|---|
| Primary city | Hackettstown |
| State | New Jersey (NJ) |
| County | Warren FIPS 34041 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 32,105 |
| Coordinates | 40.860340, -74.831920 |
How ZIP+4 works in 07840
The four digits after the hyphen encode a delivery segment inside 07840. 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 07840 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 07840.
| ZIP | City | Distance |
|---|---|---|
| 07880 | Vienna, NJ | 2.9 mi |
| 07870 | Schooleys Mountain, NJ | 3.8 mi |
| 07828 | Budd Lake, NJ | 4.5 mi |
| 07838 | Great Meadows, NJ | 4.6 mi |
| 07820 | Allamuchy, NJ | 5.1 mi |
| 07853 | Long Valley, NJ | 5.6 mi |
| 07865 | Port Murray, NJ | 6.1 mi |
| 07836 | Flanders, NJ | 6.9 mi |
| 07857 | Netcong, NJ | 7.3 mi |
| 07863 | Oxford, NJ | 7.6 mi |
| 07846 | Johnsonburg, NJ | 7.7 mi |
| 07844 | Hope, NJ | 7.9 mi |
Questions about 07840
What is the ZIP+4 code for 07840?
07840 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 07840, you need to look up a specific street address to get them.
What city is 07840?
07840 is assigned to Hackettstown, New Jersey, in Warren 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.