ZIP Code 06419 — Killingworth, CT
06419 is a standard (street delivery) ZIP code serving Killingworth, 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 06419 at a glance
| ZIP code | 06419 |
|---|---|
| Primary city | Killingworth |
| State | Connecticut (CT) |
| County | Lower Connecticut River Valley FIPS 09130 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 6,240 |
| Coordinates | 41.379230, -72.578470 |
How ZIP+4 works in 06419
The four digits after the hyphen encode a delivery segment inside 06419. 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 06419 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 06419.
| ZIP | City | Distance |
|---|---|---|
| 06443 | Madison, CT | 3.7 mi |
| 06412 | Chester, CT | 5.3 mi |
| 06441 | Higganum, CT | 6 mi |
| 06413 | Clinton, CT | 6.1 mi |
| 06417 | Deep River, CT | 6.1 mi |
| 06438 | Haddam, CT | 6.4 mi |
| 06437 | Guilford, CT | 7 mi |
| 06442 | Ivoryton, CT | 7.4 mi |
| 06498 | Westbrook, CT | 7.6 mi |
| 06422 | Durham, CT | 7.9 mi |
| 06409 | Centerbrook, CT | 8.4 mi |
| 06426 | Essex, CT | 9.5 mi |
Questions about 06419
What is the ZIP+4 code for 06419?
06419 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 06419, you need to look up a specific street address to get them.
What city is 06419?
06419 is assigned to Killingworth, 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.