20 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 46530 | Granger | 31,598 |
| 46544 | Mishawaka | 31,077 |
| 46614 | South Bend | 29,602 |
| 46628 | South Bend | 27,685 |
| 46545 | Mishawaka | 26,606 |
| 46619 | South Bend | 21,729 |
| 46637 | South Bend | 16,200 |
| 46615 | South Bend | 14,190 |
| 46561 | Osceola | 13,996 |
| 46613 | South Bend | 12,279 |
| 46617 | South Bend | 10,032 |
| 46556 | Notre Dame | 8,344 |
| 46552 | New Carlisle | 7,047 |
| 46635 | South Bend | 6,410 |
| 46616 | South Bend | 5,979 |
| 46601 | South Bend | 4,800 |
| 46554 | North Liberty | 4,405 |
| 46536 | Lakeville | 2,964 |
| 46624 | South Bend | 28 |
| 46595 | Wyatt | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 20 ZCTAs in St. Joseph County, Indiana (US Census).