ZIP Code 06371 — Old Lyme, CT
06371 is a standard (street delivery) ZIP code serving Old Lyme, Connecticut, in Lower Connecticut River Valley 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 06371 at a glance
| ZIP code | 06371 |
|---|---|
| Primary city | Old Lyme |
| State | Connecticut (CT) |
| County | Lower Connecticut River Valley FIPS 09130 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 9,828 |
| Coordinates | 41.363610, -72.325820 |
How ZIP+4 works in 06371
The four digits after the hyphen encode a delivery segment inside 06371. 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 06371 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 06371.
| ZIP | City | Distance |
|---|---|---|
| 06426 | Essex, CT | 3.8 mi |
| 06333 | East Lyme, CT | 4.4 mi |
| 06409 | Centerbrook, CT | 5 mi |
| 06439 | Hadlyme, CT | 5.2 mi |
| 06475 | Old Saybrook, CT | 5.3 mi |
| 06376 | South Lyme, CT | 6.1 mi |
| 06357 | Niantic, CT | 6.3 mi |
| 06442 | Ivoryton, CT | 6.3 mi |
| 06417 | Deep River, CT | 7.1 mi |
| 06423 | East Haddam, CT | 7.9 mi |
| 06498 | Westbrook, CT | 8.3 mi |
| 06412 | Chester, CT | 8.7 mi |
Questions about 06371
What is the ZIP+4 code for 06371?
06371 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 06371, you need to look up a specific street address to get them.
What city is 06371?
06371 is assigned to Old Lyme, Connecticut, in Lower Connecticut River Valley 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.