Parent Lineage
Castle Peak: 11,820' ID 4,040' Rise
| Depth | Parent | Elevation | Saddle | Prominence | State |
| 1 | "Goat Mountain" | 11,913' | 11,099' | 814' | ID |
| 2 | Hyndman Peak | 12,009' | 7,180' | 4,829' | ID |
| 3 | Borah Peak | 12,666' | 6,670' | 5,996' | ID |
| 4 | Francs Peak | 13,161' | 9,102' | 4,059' | WY |
| 5 | Downs Mountain | 13,356' | 11,778' | 1,578' | WY |
| 6 | Flagstone Peak | 13,445' | 12,619' | 826' | WY |
| 7 | Bastion Peak | 13,490' | 12,735' | 755' | WY |
| 8 | Gannett Peak | 13,811' | 6,732' | 7,079' | WY |
| 9 | Longs Peak | 14,259' | 11,312' | 2,947' | CO |
| 10 | Torreys Peak | 14,272' | 13,723' | 549' | CO |
| 11 | Grays Peak | 14,275' | 11,493' | 2,782' | CO |
| 12 | Lincoln, Mount | 14,293' | 10,433' | 3,860' | CO |
| 13 | Massive, Mount | 14,427' | 12,444' | 1,983' | CO |
| 14 | Elbert, Mount | 14,438' | 5,346' | 9,092' | CO |
| 15 | Whitney, Mount | 14,494' | 4,415' | 10,079' | CA |
Green = More Prominent Parent
Immediate Children:
| # | Child | Elevation | Prominence | State |
| 1 | Ryan Peak | 11,719' | 3,211' | ID |
| 2 | "Calkens Peak" | 11,513' | 1,280' | ID |
| 3 | Merriam Peak | 10,937' | 558' | ID |
| 4 | Patterson Peak | 10,882' | 268' | ID |
| 5 | "Fourth of July Peak" | 10,720' | 1,151' | ID |
| 6 | 10412 | 10,412' | 307' | ID |
| 7 | Blackmon Peak | 10,306' | 408' | ID |
| 8 | "Mount Ernie Day" | 9,949' | 563' | ID |
| 9 | 7214 | 7,214' | 434' | ID |
| 10 | 7340 | 7,340' | 320' | ID |
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