ZIP Code 62903 — Carbondale, IL
62903 is a standard (street delivery) ZIP code serving Carbondale, Illinois, in Jackson 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 62903 at a glance
| ZIP code | 62903 |
|---|---|
| Primary city | Carbondale |
| State | Illinois (IL) |
| County | Jackson FIPS 17077 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,666 |
| Coordinates | 37.671620, -89.275680 |
How ZIP+4 works in 62903
The four digits after the hyphen encode a delivery segment inside 62903. 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 62903 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 Carbondale
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 62903.
| ZIP | City | Distance |
|---|---|---|
| 62975 | Pomona, IL | 5.7 mi |
| 62901 | Carbondale, IL | 5.9 mi |
| 62966 | Murphysboro, IL | 7.9 mi |
| 62905 | Alto Pass, IL | 8.1 mi |
| 62958 | Makanda, IL | 8.3 mi |
| 62920 | Cobden, IL | 8.7 mi |
| 62902 | Carbondale, IL | 8.8 mi |
| 62924 | De Soto, IL | 11 mi |
| 62940 | Gorham, IL | 11 mi |
| 62942 | Grand Tower, IL | 11.3 mi |
| 62915 | Cambria, IL | 11.4 mi |
| 62918 | Carterville, IL | 13 mi |
Questions about 62903
What is the ZIP+4 code for 62903?
62903 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 62903, you need to look up a specific street address to get them.
What city is 62903?
62903 is assigned to Carbondale, Illinois, in Jackson 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.