ZIP Code 06373 — Oneco, CT
06373 is a standard (street delivery) ZIP code serving Oneco, 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 06373 at a glance
| ZIP code | 06373 |
|---|---|
| Primary city | Oneco |
| State | Connecticut (CT) |
| County | Northeastern Connecticut FIPS 09150 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 219 |
| Coordinates | 41.683940, -71.798810 |
How ZIP+4 works in 06373
The four digits after the hyphen encode a delivery segment inside 06373. 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 06373 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 06373.
| ZIP | City | Distance |
|---|---|---|
| 06354 | Moosup, CT | 2.8 mi |
| 06377 | Sterling, CT | 3.1 mi |
| 02827 | Greene, RI | 3.3 mi |
| 06374 | Plainfield, CT | 6 mi |
| 06332 | Central Village, CT | 6.5 mi |
| 06387 | Wauregan, CT | 7.1 mi |
| 06384 | Voluntown, CT | 7.2 mi |
| 02825 | Foster, RI | 7.7 mi |
| 02817 | West Greenwich, RI | 7.8 mi |
| 06239 | Danielson, CT | 8 mi |
| 02816 | Coventry, RI | 9.2 mi |
| 02815 | Clayville, RI | 9.6 mi |
Questions about 06373
What is the ZIP+4 code for 06373?
06373 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 06373, you need to look up a specific street address to get them.
What city is 06373?
06373 is assigned to Oneco, 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.