ZIP Code 08821 — Flagtown, NJ
08821 is a standard (street delivery) ZIP code serving Flagtown, New Jersey, in Somerset 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 08821 at a glance
| ZIP code | 08821 |
|---|---|
| Primary city | Flagtown |
| State | New Jersey (NJ) |
| County | Somerset FIPS 34035 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 283 |
| Coordinates | 40.520740, -74.688350 |
How ZIP+4 works in 08821
The four digits after the hyphen encode a delivery segment inside 08821. 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 08821 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 08821.
| ZIP | City | Distance |
|---|---|---|
| 08844 | Hillsborough, NJ | 1.7 mi |
| 08853 | Neshanic Station, NJ | 2.9 mi |
| 08869 | Raritan, NJ | 4.3 mi |
| 08876 | Somerville, NJ | 4.7 mi |
| 08502 | Belle Mead, NJ | 5.3 mi |
| 08835 | Manville, NJ | 5.4 mi |
| 08887 | Three Bridges, NJ | 5.6 mi |
| 08890 | Zarephath, NJ | 6.1 mi |
| 08807 | Bridgewater, NJ | 6.1 mi |
| 08889 | Whitehouse Station, NJ | 7 mi |
| 08558 | Skillman, NJ | 7.4 mi |
| 08873 | Somerset, NJ | 8.3 mi |
Questions about 08821
What is the ZIP+4 code for 08821?
08821 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 08821, you need to look up a specific street address to get them.
What city is 08821?
08821 is assigned to Flagtown, New Jersey, in Somerset 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.