ZIP Code 12418 — Cornwallville, NY
12418 is a standard (street delivery) ZIP code serving Cornwallville, New York, in Greene 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 12418 at a glance
| ZIP code | 12418 |
|---|---|
| Primary city | Cornwallville |
| State | New York (NY) |
| County | Greene FIPS 36039 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 427 |
| Coordinates | 42.358630, -74.160900 |
How ZIP+4 works in 12418
The four digits after the hyphen encode a delivery segment inside 12418. 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 12418 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 12418.
| ZIP | City | Distance |
|---|---|---|
| 12423 | East Durham, NY | 2.9 mi |
| 12422 | Durham, NY | 3.1 mi |
| 12405 | Acra, NY | 4.3 mi |
| 12439 | Hensonville, NY | 4.5 mi |
| 12460 | Oak Hill, NY | 4.5 mi |
| 12454 | Maplecrest, NY | 5 mi |
| 12496 | Windham, NY | 6.1 mi |
| 12120 | Medusa, NY | 6.9 mi |
| 12469 | Preston Hollow, NY | 7.3 mi |
| 12431 | Freehold, NY | 7.3 mi |
| 12413 | Cairo, NY | 7.5 mi |
| 12424 | East Jewett, NY | 7.8 mi |
Questions about 12418
What is the ZIP+4 code for 12418?
12418 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 12418, you need to look up a specific street address to get them.
What city is 12418?
12418 is assigned to Cornwallville, New York, in Greene 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.