ZIP Code 12151 — Round Lake, NY
12151 is a standard (street delivery) ZIP code serving Round Lake, New York, in Saratoga 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 12151 at a glance
| ZIP code | 12151 |
|---|---|
| Primary city | Round Lake |
| State | New York (NY) |
| County | Saratoga FIPS 36091 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 967 |
| Coordinates | 42.925530, -73.788740 |
How ZIP+4 works in 12151
The four digits after the hyphen encode a delivery segment inside 12151. 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 12151 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 12151.
| ZIP | City | Distance |
|---|---|---|
| 12118 | Mechanicville, NY | 3.5 mi |
| 12019 | Ballston Lake, NY | 4.7 mi |
| 12065 | Clifton Park, NY | 4.9 mi |
| 12027 | Burnt Hills, NY | 6.1 mi |
| 12020 | Ballston Spa, NY | 6.8 mi |
| 12148 | Rexford, NY | 7 mi |
| 12008 | Alplaus, NY | 7.7 mi |
| 12170 | Stillwater, NY | 8.2 mi |
| 12188 | Waterford, NY | 8.7 mi |
| 12154 | Schaghticoke, NY | 9.5 mi |
| 12309 | Schenectady, NY | 9.7 mi |
| 12308 | Schenectady, NY | 9.8 mi |
Questions about 12151
What is the ZIP+4 code for 12151?
12151 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 12151, you need to look up a specific street address to get them.
What city is 12151?
12151 is assigned to Round Lake, New York, in Saratoga 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.