ZIP Code 62427 — Flat Rock, IL
62427 is a standard (street delivery) ZIP code serving Flat Rock, Illinois, in Crawford 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 62427 at a glance
| ZIP code | 62427 |
|---|---|
| Primary city | Flat Rock |
| State | Illinois (IL) |
| County | Crawford FIPS 17033 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,730 |
| Coordinates | 38.873010, -87.658910 |
How ZIP+4 works in 62427
The four digits after the hyphen encode a delivery segment inside 62427. 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 62427 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 62427.
| ZIP | City | Distance |
|---|---|---|
| 62451 | Palestine, IL | 8.8 mi |
| 62439 | Lawrenceville, IL | 8.8 mi |
| 62454 | Robinson, IL | 10.1 mi |
| 47561 | Oaktown, IN | 12 mi |
| 62464 | Stoy, IL | 12.4 mi |
| 62417 | Bridgeport, IL | 13.1 mi |
| 47861 | Merom, IN | 14.2 mi |
| 62466 | Sumner, IL | 14.4 mi |
| 47516 | Bruceville, IN | 14.9 mi |
| 47838 | Carlisle, IN | 16.2 mi |
| 62449 | Oblong, IL | 16.3 mi |
| 62433 | Hutsonville, IL | 16.7 mi |
Questions about 62427
What is the ZIP+4 code for 62427?
62427 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 62427, you need to look up a specific street address to get them.
What city is 62427?
62427 is assigned to Flat Rock, Illinois, in Crawford 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.