ZIP Code 02127 — South Boston, MA
02127 is a standard (street delivery) ZIP code serving South Boston, Massachusetts, in Suffolk 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 02127 at a glance
| ZIP code | 02127 |
|---|---|
| Primary city | South Boston |
| State | Massachusetts (MA) |
| County | Suffolk FIPS 25025 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 36,769 |
| Coordinates | 42.334550, -71.038750 |
How ZIP+4 works in 02127
The four digits after the hyphen encode a delivery segment inside 02127. 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 02127 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 02127.
| ZIP | City | Distance |
|---|---|---|
| 02210 | Boston, MA | 0.9 mi |
| 02205 | Boston, MA | 1.3 mi |
| 02125 | Dorchester, MA | 1.6 mi |
| 02118 | Boston, MA | 1.6 mi |
| 02111 | Boston, MA | 1.6 mi |
| 02110 | Boston, MA | 1.7 mi |
| 02108 | Boston, MA | 2 mi |
| 02203 | Boston, MA | 2.1 mi |
| 02133 | Boston, MA | 2.1 mi |
| 02116 | Boston, MA | 2.2 mi |
| 02109 | Boston, MA | 2.2 mi |
| 02113 | Boston, MA | 2.3 mi |
Questions about 02127
What is the ZIP+4 code for 02127?
02127 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 02127, you need to look up a specific street address to get them.
What city is 02127?
02127 is assigned to South Boston, Massachusetts, in Suffolk 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.