| Official Zip Code Name | Saint Jacob |
| Zip Code State | Illinois |
| Primary County: | Madison |
| Area Code | 618 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 479 ft. |
| Area | 33.349 Sqm. |
| Coordinates(Y,X) | 38.708873, -89.791702 |