| Official Name: | Piasa, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Piasa |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Macoupin |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 594 |
| Coordinates: | 39.1158°N -90.1236°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 62079 |
| Area Code: | 618 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 415623 |
Piasa is an unincorporated community in Macoupin County, Illinois, United States. Piasa is located on Illinois Route 16 4miles west of Shipman. Piasa has a post office with ZIP code 62079.[1]