ZIP Code 40037 — Loretto, KY
40037 is a standard (street delivery) ZIP code serving Loretto, Kentucky, in Marion 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 40037 at a glance
| ZIP code | 40037 |
|---|---|
| Primary city | Loretto |
| State | Kentucky (KY) |
| County | Marion FIPS 21155 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,793 |
| Coordinates | 37.654090, -85.411960 |
How ZIP+4 works in 40037
The four digits after the hyphen encode a delivery segment inside 40037. 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 40037 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 40037.
| ZIP | City | Distance |
|---|---|---|
| 40049 | Nerinx, KY | 1.1 mi |
| 40062 | Saint Francis, KY | 3.9 mi |
| 40063 | Saint Mary, KY | 6.9 mi |
| 40052 | New Hope, KY | 7.3 mi |
| 40060 | Raywick, KY | 8.4 mi |
| 40061 | Saint Catharine, KY | 9 mi |
| 40051 | New Haven, KY | 9.2 mi |
| 40004 | Bardstown, KY | 10.7 mi |
| 40069 | Springfield, KY | 11.4 mi |
| 40033 | Lebanon, KY | 11.5 mi |
| 40107 | Boston, KY | 14.7 mi |
| 42716 | Buffalo, KY | 16.8 mi |
Questions about 40037
What is the ZIP+4 code for 40037?
40037 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 40037, you need to look up a specific street address to get them.
What city is 40037?
40037 is assigned to Loretto, Kentucky, in Marion 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.