ZIP Code 02128 — East Boston, MA
02128 is a standard (street delivery) ZIP code serving East 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 02128 at a glance
| ZIP code | 02128 |
|---|---|
| Primary city | East Boston |
| State | Massachusetts (MA) |
| County | Suffolk FIPS 25025 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 43,345 |
| Coordinates | 42.373240, -71.016160 |
How ZIP+4 works in 02128
The four digits after the hyphen encode a delivery segment inside 02128. 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 02128 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 02128.
| ZIP | City | Distance |
|---|---|---|
| 02152 | Winthrop, MA | 1.8 mi |
| 02150 | Chelsea, MA | 1.8 mi |
| 02109 | Boston, MA | 2 mi |
| 02110 | Boston, MA | 2.1 mi |
| 02113 | Boston, MA | 2.1 mi |
| 02210 | Boston, MA | 2.1 mi |
| 02129 | Charlestown, MA | 2.4 mi |
| 02203 | Boston, MA | 2.4 mi |
| 02205 | Boston, MA | 2.6 mi |
| 02133 | Boston, MA | 2.6 mi |
| 02111 | Boston, MA | 2.7 mi |
| 02108 | Boston, MA | 2.7 mi |
Questions about 02128
What is the ZIP+4 code for 02128?
02128 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 02128, you need to look up a specific street address to get them.
What city is 02128?
02128 is assigned to East 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.