ZIP Code 42003 — Paducah, KY
42003 is a standard (street delivery) ZIP code serving Paducah, Kentucky, in McCracken 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 42003 at a glance
| ZIP code | 42003 |
|---|---|
| Primary city | Paducah |
| State | Kentucky (KY) |
| County | McCracken FIPS 21145 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 29,672 |
| Coordinates | 37.006530, -88.584720 |
How ZIP+4 works in 42003
The four digits after the hyphen encode a delivery segment inside 42003. 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 42003 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.
Other ZIP codes in Paducah
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 42003.
| ZIP | City | Distance |
|---|---|---|
| 42027 | Boaz, KY | 6.7 mi |
| 42058 | Ledbetter, KY | 7 mi |
| 42001 | Paducah, KY | 7.3 mi |
| 42082 | Symsonia, KY | 7.8 mi |
| 62910 | Brookport, IL | 10.7 mi |
| 42029 | Calvert City, KY | 10.8 mi |
| 42051 | Hickory, KY | 10.9 mi |
| 42069 | Melber, KY | 11.2 mi |
| 42086 | West Paducah, KY | 11.4 mi |
| 42061 | Lowes, KY | 13.3 mi |
| 42060 | Lovelaceville, KY | 13.7 mi |
| 42035 | Cunningham, KY | 15.6 mi |
Questions about 42003
What is the ZIP+4 code for 42003?
42003 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 42003, you need to look up a specific street address to get them.
What city is 42003?
42003 is assigned to Paducah, Kentucky, in McCracken 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.