ZIP Code 06377 — Sterling, CT
06377 is a standard (street delivery) ZIP code serving Sterling, Connecticut, in Northeastern Connecticut 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 06377 at a glance
| ZIP code | 06377 |
|---|---|
| Primary city | Sterling |
| State | Connecticut (CT) |
| County | Northeastern Connecticut FIPS 09150 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,927 |
| Coordinates | 41.727080, -71.816790 |
How ZIP+4 works in 06377
The four digits after the hyphen encode a delivery segment inside 06377. 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 06377 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 06377.
| ZIP | City | Distance |
|---|---|---|
| 06354 | Moosup, CT | 2.6 mi |
| 06373 | Oneco, CT | 3.1 mi |
| 02827 | Greene, RI | 4.5 mi |
| 06332 | Central Village, CT | 4.8 mi |
| 06387 | Wauregan, CT | 4.9 mi |
| 06239 | Danielson, CT | 4.9 mi |
| 02825 | Foster, RI | 6 mi |
| 06374 | Plainfield, CT | 6 mi |
| 06234 | Brooklyn, CT | 8.2 mi |
| 06243 | East Killingly, CT | 8.3 mi |
| 02815 | Clayville, RI | 8.7 mi |
| 06263 | Rogers, CT | 8.8 mi |
Questions about 06377
What is the ZIP+4 code for 06377?
06377 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 06377, you need to look up a specific street address to get them.
What city is 06377?
06377 is assigned to Sterling, Connecticut, in Northeastern Connecticut 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.