ZIP Code 06237 — Columbia, CT
06237 is a standard (street delivery) ZIP code serving Columbia, Connecticut, in Capitol 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 06237 at a glance
| ZIP code | 06237 |
|---|---|
| Primary city | Columbia |
| State | Connecticut (CT) |
| County | Capitol FIPS 09110 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 5,300 |
| Coordinates | 41.693870, -72.307220 |
How ZIP+4 works in 06237
The four digits after the hyphen encode a delivery segment inside 06237. 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 06237 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 06237.
| ZIP | City | Distance |
|---|---|---|
| 06232 | Andover, CT | 4.5 mi |
| 06248 | Hebron, CT | 5.1 mi |
| 06226 | Willimantic, CT | 5.2 mi |
| 06249 | Lebanon, CT | 5.5 mi |
| 06231 | Amston, CT | 5.8 mi |
| 06238 | Coventry, CT | 6.4 mi |
| 06266 | South Windham, CT | 7.2 mi |
| 06268 | Storrs Mansfield, CT | 7.8 mi |
| 06250 | Mansfield Center, CT | 8 mi |
| 06256 | North Windham, CT | 8.3 mi |
| 06043 | Bolton, CT | 8.4 mi |
| 06269 | Storrs Mansfield, CT | 8.5 mi |
Questions about 06237
What is the ZIP+4 code for 06237?
06237 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 06237, you need to look up a specific street address to get them.
What city is 06237?
06237 is assigned to Columbia, Connecticut, in Capitol 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.