ZIP Code 06443 — Madison, CT
06443 is a standard (street delivery) ZIP code serving Madison, Connecticut, in South Central 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 06443 at a glance
| ZIP code | 06443 |
|---|---|
| Primary city | Madison |
| State | Connecticut (CT) |
| County | South Central Connecticut FIPS 09170 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 17,657 |
| Coordinates | 41.339760, -72.627830 |
How ZIP+4 works in 06443
The four digits after the hyphen encode a delivery segment inside 06443. 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 06443 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 06443.
| ZIP | City | Distance |
|---|---|---|
| 06419 | Killingworth, CT | 3.7 mi |
| 06437 | Guilford, CT | 3.8 mi |
| 06413 | Clinton, CT | 5.8 mi |
| 06471 | North Branford, CT | 7.6 mi |
| 06472 | Northford, CT | 8.4 mi |
| 06498 | Westbrook, CT | 8.7 mi |
| 06417 | Deep River, CT | 8.8 mi |
| 06412 | Chester, CT | 8.8 mi |
| 06422 | Durham, CT | 8.9 mi |
| 06441 | Higganum, CT | 9.1 mi |
| 06442 | Ivoryton, CT | 9.5 mi |
| 06405 | Branford, CT | 9.6 mi |
Questions about 06443
What is the ZIP+4 code for 06443?
06443 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 06443, you need to look up a specific street address to get them.
What city is 06443?
06443 is assigned to Madison, Connecticut, in South Central 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.