ZIP Code 08830 — Iselin, NJ
08830 is a standard (street delivery) ZIP code serving Iselin, New Jersey, in Middlesex 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 08830 at a glance
| ZIP code | 08830 |
|---|---|
| Primary city | Iselin |
| State | New Jersey (NJ) |
| County | Middlesex FIPS 34023 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 19,551 |
| Coordinates | 40.569640, -74.317190 |
How ZIP+4 works in 08830
The four digits after the hyphen encode a delivery segment inside 08830. 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 08830 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 08830.
| ZIP | City | Distance |
|---|---|---|
| 07067 | Colonia, NJ | 1.6 mi |
| 07095 | Woodbridge, NJ | 1.9 mi |
| 08863 | Fords, NJ | 2.2 mi |
| 08820 | Edison, NJ | 2.6 mi |
| 07001 | Avenel, NJ | 2.7 mi |
| 08840 | Metuchen, NJ | 2.8 mi |
| 07065 | Rahway, NJ | 3.2 mi |
| 07077 | Sewaren, NJ | 3.4 mi |
| 07066 | Clark, NJ | 3.5 mi |
| 07064 | Port Reading, NJ | 3.7 mi |
| 08832 | Keasbey, NJ | 4 mi |
| 08861 | Perth Amboy, NJ | 4.1 mi |
Questions about 08830
What is the ZIP+4 code for 08830?
08830 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 08830, you need to look up a specific street address to get them.
What city is 08830?
08830 is assigned to Iselin, New Jersey, in Middlesex 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.