| 310 | Duchess | Sarah Churchill, Duchess of MarlboroughDuchess | Spencer (House of) | — | | unknown | 7 ch.Children (no sourced line of succession) | d. 1744 |
| 2875 | Duke | Charles Spencer, 3rd Duke of MarlboroughDuke | Spencer (House of) | — | | Charles Spencer, 3rd Earl of Sunderland | 5 ch.Children (no sourced line of succession) | d. 1758 |
| 2877 | Duchess | Diana Russell, Duchess of BedfordDuchess | Spencer (House of) | — | | Charles Spencer, 3rd Earl of Sunderland | 1 ch.Children (no sourced line of succession) | d. 1735 |
| 2892 | Duke | George Spencer, 4th Duke of MarlboroughDuke | Spencer (House of) | — | | Charles Spencer, 3rd Duke of Marlborough | 8 ch.Children (no sourced line of succession) | d. 1817 |
| 2903 | Duke | George Spencer-Churchill, 5th Duke of MarlboroughDuke | Spencer (House of) | — | | George Spencer, 4th Duke of Marlborough | 5 ch.Children (no sourced line of succession) | d. 1840 |
| 2922 | Duchess | Charlotte Spencer-Churchill, Duchess of MarlboroughDuchess | Spencer (House of) | — | | unknown | 2 ch.Children (no sourced line of succession) | d. 1850 |
| 2925 | Duchess | Frances Spencer-Churchill, Duchess of MarlboroughDuchess | Spencer (House of) | — | | unknown | 11 ch.Children (no sourced line of succession) | d. 1899 |
| 2926 | Duke | John Spencer-Churchill, 7th Duke of MarlboroughDuke | Spencer (House of) | — | | unknown | 11 ch.Children (no sourced line of succession) | d. 1883 |
| 2942 | Duchess | Lily Spencer-Churchill, Duchess of MarlboroughDuchess | Spencer (House of) | 🇺🇸US | | unknown | 1 ch.Children (no sourced line of succession) | d. 1909 |
| 2957 | Duke | John Spencer-Churchill, 10th Duke of MarlboroughDuke | Spencer (House of) | 🇬🇧GB+1 | | Charles Spencer-Churchill, 9th Duke of Marlborough | 5 ch.Children (no sourced line of succession) | d. 1972 |
| 2976 | Duchess of Marlboroughc | Rosita Spencer-Churchill, Duchess of MarlboroughDuchess of Marlborough (c) | Spencer (House of) | 🇬🇧GB | | Carl Douglas | 3 ch.Children (no sourced line of succession) | 83 |
| 2978 | Duchess | Lily SahniDuchess | Spencer (House of) | 🇮🇷IR | | unknown | 0 ch. | ~72 |
| 2979 | Duke | James Spencer-Churchill, 12th Duke of MarlboroughDuke | Spencer (House of) | 🇬🇧GB | 12 y 26 d | John Spencer-Churchill, 11th Duke of Marlborough | 3 ch.Children (no sourced line of succession) | 70 |
| 2984 | Duchess | Diana, Princess of WalesDuchess | Spencer (House of) | 🇬🇧GB | | John Spencer, 8th Earl Spencer | 2 ch.Children (no sourced line of succession) | d. 1997 |
| 2990 | Duchess | Edla Spencer-Churchill, Duchess of MarlboroughDuchess | Spencer (House of) | 🇬🇧GB | | unknown | 2 ch.Children (no sourced line of succession) | ~58 |