ZIP Code 60423 — Frankfort, IL
60423 is a standard (street delivery) ZIP code serving Frankfort, Illinois, in Will 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 60423 at a glance
| ZIP code | 60423 |
|---|---|
| Primary city | Frankfort |
| State | Illinois (IL) |
| County | Will FIPS 17197 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 32,836 |
| Coordinates | 41.479220, -87.839610 |
How ZIP+4 works in 60423
The four digits after the hyphen encode a delivery segment inside 60423. 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 60423 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 60423.
| ZIP | City | Distance |
|---|---|---|
| 60448 | Mokena, IL | 4.9 mi |
| 60443 | Matteson, IL | 5.1 mi |
| 60471 | Richton Park, IL | 5.7 mi |
| 60487 | Tinley Park, IL | 5.8 mi |
| 60449 | Monee, IL | 5.8 mi |
| 60451 | New Lenox, IL | 6.6 mi |
| 60477 | Tinley Park, IL | 7.1 mi |
| 60484 | University Park, IL | 7.2 mi |
| 60478 | Country Club Hills, IL | 7.4 mi |
| 60461 | Olympia Fields, IL | 8.1 mi |
| 60466 | Park Forest, IL | 8.1 mi |
| 60467 | Orland Park, IL | 8.6 mi |
Questions about 60423
What is the ZIP+4 code for 60423?
60423 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 60423, you need to look up a specific street address to get them.
What city is 60423?
60423 is assigned to Frankfort, Illinois, in Will 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.