In 1614 Joseph Killigrew (age 20) was elected MP St Ives.

In 1681 James Praed (age 26) was elected MP St Ives.

In 1689 James Praed (age 34) was elected MP St Ives.

In 1715 John Hobart 1st Earl Buckinghamshire (age 21) was elected MP St Ives.

In 1722 John Hobart 1st Earl Buckinghamshire (age 28) was elected MP St Ives.

In 1775 Thomas Wynn 1st Baron Newborough (age 39) was elected MP St Ives.

In 1812 William Pole Tylney Long Wellesley 4th Earl Mornington (age 23) was elected MP St Ives.

In 1830 William Pole Tylney Long Wellesley 4th Earl Mornington (age 41) was elected MP St Ives.

In 1831 Edward George Bulwer-Lytton 1st Baron Lytton (age 27) was elected MP St Ives which seat he held until 1832.

In 1885 John St Aubyn 1st Baron St Levan (age 55) was elected MP St Ives.