The Earl holds the subsidiary titles of Viscount Lewisham (1711) and Baron Dartmouth (1682), the latter in the Peerage of England.
Barons Dartmouth (1682) George Legge, 1st Baron Dartmouth (1647-1691) William Legge, 2nd Baron Dartmouth (1672-1750) (became Earl of Dartmouth in 1711) Earls of Dartmouth (1711) William Legge, 1st Earl of Dartmouth (1672-1750) William Legge, 2nd Earl of Dartmouth (1731-1801) George Legge, 3rd Earl of Dartmouth (1755-1810) William Legge, 4th Earl of Dartmouth (1784-1853) William Walter Legge, 5th Earl of Dartmouth (1823-1891) William Heneage Legge, 6th Earl of Dartmouth (1851-1936) William Legge, 7th Earl of Dartmouth (1881-1958) Humphrey Legge, 8th Earl of Dartmouth (1888-1962) Gerald Humphrey Legge, 9th Earl of Dartmouth (1924-1997) William Legge, 10th Earl of Dartmouth (b.1949)
