| Official Zip Code Name | Chapin |
| Zip Code State | Illinois |
| Primary County: | Morgan |
| Area Code | 217 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 603 ft. |
| Area | 38.974 Sqm. |
| Coordinates(Y,X) | 39.802327, -90.401512 |