ZIP Code 60428 — Markham, IL
60428 is a standard (street delivery) ZIP code serving Markham, Illinois, in Cook 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 60428 at a glance
| ZIP code | 60428 |
|---|---|
| Primary city | Markham |
| State | Illinois (IL) |
| County | Cook FIPS 17031 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 10,927 |
| Coordinates | 41.599800, -87.690620 |
How ZIP+4 works in 60428
The four digits after the hyphen encode a delivery segment inside 60428. 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 60428 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 60428.
| ZIP | City | Distance |
|---|---|---|
| 60429 | Hazel Crest, IL | 1.8 mi |
| 60469 | Posen, IL | 2 mi |
| 60426 | Harvey, IL | 2.1 mi |
| 60445 | Midlothian, IL | 3 mi |
| 60472 | Robbins, IL | 3.2 mi |
| 60430 | Homewood, IL | 3.2 mi |
| 60452 | Oak Forest, IL | 3.3 mi |
| 60406 | Blue Island, IL | 3.8 mi |
| 60478 | Country Club Hills, IL | 3.9 mi |
| 60418 | Crestwood, IL | 4.1 mi |
| 60422 | Flossmoor, IL | 4.2 mi |
| 60827 | Riverdale, IL | 4.6 mi |
Questions about 60428
What is the ZIP+4 code for 60428?
60428 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 60428, you need to look up a specific street address to get them.
What city is 60428?
60428 is assigned to Markham, Illinois, in Cook 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.