ZIP Code 01550 — Southbridge, MA
01550 is a standard (street delivery) ZIP code serving Southbridge, Massachusetts, in Worcester 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 01550 at a glance
| ZIP code | 01550 |
|---|---|
| Primary city | Southbridge |
| State | Massachusetts (MA) |
| County | Worcester FIPS 25027 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 17,928 |
| Coordinates | 42.060390, -72.033770 |
How ZIP+4 works in 01550
The four digits after the hyphen encode a delivery segment inside 01550. 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 01550 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 01550.
| ZIP | City | Distance |
|---|---|---|
| 01566 | Sturbridge, MA | 3.8 mi |
| 01571 | Dudley, MA | 5.1 mi |
| 06262 | Quinebaug, CT | 5.2 mi |
| 01518 | Fiskdale, MA | 5.6 mi |
| 06281 | Woodstock, CT | 6.1 mi |
| 01507 | Charlton, MA | 6.2 mi |
| 01521 | Holland, MA | 6.8 mi |
| 06282 | Woodstock Valley, CT | 8.3 mi |
| 06255 | North Grosvenordale, CT | 8.4 mi |
| 01570 | Webster, MA | 9.5 mi |
| 01540 | Oxford, MA | 9.8 mi |
| 01506 | Brookfield, MA | 9.9 mi |
Questions about 01550
What is the ZIP+4 code for 01550?
01550 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 01550, you need to look up a specific street address to get them.
What city is 01550?
01550 is assigned to Southbridge, Massachusetts, in Worcester 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.