| Official Name: | Frederick, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Schuyler |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 449 |
| Coordinates: | 40.07°N -90.4289°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 62639 |
| Area Code: | 217 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 408710[1] |
Frederick is an unincorporated community in Schuyler County, Illinois, United States. Frederick is near the Illinois River, 4miles north of Beardstown. Frederick has a post office with ZIP code 62639.[2]