ZIP Code 12138 — Petersburg, NY
12138 is a standard (street delivery) ZIP code serving Petersburg, New York, in Rensselaer 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 12138 at a glance
| ZIP code | 12138 |
|---|---|
| Primary city | Petersburg |
| State | New York (NY) |
| County | Rensselaer FIPS 36083 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,695 |
| Coordinates | 42.737350, -73.371280 |
How ZIP+4 works in 12138
The four digits after the hyphen encode a delivery segment inside 12138. 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 12138 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 12138.
| ZIP | City | Distance |
|---|---|---|
| 12082 | Grafton, NY | 4.4 mi |
| 12022 | Berlin, NY | 5.2 mi |
| 12052 | Cropseyville, NY | 5.6 mi |
| 12040 | Cherry Plain, NY | 7.4 mi |
| 05260 | North Pownal, VT | 7.8 mi |
| 01267 | Williamstown, MA | 8.2 mi |
| 05261 | Pownal, VT | 8.4 mi |
| 12153 | Sand Lake, NY | 8.5 mi |
| 12090 | Hoosick Falls, NY | 9.9 mi |
| 12140 | Poestenkill, NY | 10.5 mi |
| 12018 | Averill Park, NY | 10.8 mi |
| 12169 | Stephentown, NY | 11.2 mi |
Questions about 12138
What is the ZIP+4 code for 12138?
12138 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 12138, you need to look up a specific street address to get them.
What city is 12138?
12138 is assigned to Petersburg, New York, in Rensselaer 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.