ZIP Code 06840 — New Canaan, CT
06840 is a standard (street delivery) ZIP code serving New Canaan, Connecticut, in Western 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 06840 at a glance
| ZIP code | 06840 |
|---|---|
| Primary city | New Canaan |
| State | Connecticut (CT) |
| County | Western Connecticut FIPS 09190 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 20,870 |
| Coordinates | 41.159250, -73.499160 |
How ZIP+4 works in 06840
The four digits after the hyphen encode a delivery segment inside 06840. 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 06840 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 06840.
| ZIP | City | Distance |
|---|---|---|
| 06850 | Norwalk, CT | 3.7 mi |
| 06903 | Stamford, CT | 4.1 mi |
| 06907 | Stamford, CT | 4.1 mi |
| 06897 | Wilton, CT | 4.5 mi |
| 06851 | Norwalk, CT | 5.1 mi |
| 10576 | Pound Ridge, NY | 5.3 mi |
| 06905 | Stamford, CT | 5.4 mi |
| 06820 | Darien, CT | 5.5 mi |
| 06854 | Norwalk, CT | 5.9 mi |
| 06906 | Stamford, CT | 6.1 mi |
| 10590 | South Salem, NY | 6.8 mi |
| 06853 | Norwalk, CT | 7 mi |
Questions about 06840
What is the ZIP+4 code for 06840?
06840 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 06840, you need to look up a specific street address to get them.
What city is 06840?
06840 is assigned to New Canaan, Connecticut, in Western 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.