In 1491 John Mordaunt (age 35) was elected MP Grantham.

On 22 Jan 1545 Edward Warner (age 34) was elected MP Grantham.

In 1547 Edward Warner (age 36) was elected MP Grantham.

In Mar 1553 Edward Warner (age 42) was elected MP Grantham.

In Oct 1553 Edward Warner (age 42) was elected MP Grantham.

In 1558 Anthony Thorold (age 38) was elected MP Grantham with the support of Henry Manners 2nd Earl of Rutland (age 31)

In 1571 William Killigrew (age 16) was elected MP Grantham.

In 1584 William Thorold (age 13) was elected MP Grantham.

In 1589 William Armyn of Osgodby South Kesteven Lincolnshire (age 28) was elected MP Grantham.

In 1604 George Manners 7th Earl of Rutland (age 24) was elected MP Grantham.

In 1624 George Manners 7th Earl of Rutland (age 44) was elected MP Grantham.

In 1625 George Manners 7th Earl of Rutland (age 45) was elected MP Grantham.

In 1625 William Armine 1st Baronet (age 31) was elected MP Grantham.

In 1689 John Brownlow 3rd Baronet (age 29) was elected MP Grantham.

In 1708 Geoffrey Palmer 3rd Baronet (age 52) was elected MP Grantham.

In 1734 Michael Newton 4th Baronet (age 39) was elected MP Grantham.

In 1741 Michael Newton 4th Baronet (age 46) was elected MP Grantham.

In 1743 John Cust 3rd Baronet (age 24) was elected MP Grantham.

In 1774 Brownlow Cust 1st Baron Brownlow (age 29) was elected MP Grantham.

In 1806 Russell Manners (age 35) was elected MP Grantham which seat he held until 1807 when he did not stand.

In 1812 Robert Percy Smith (age 41) was elected MP Grantham.

In 1818 Edward Cust 1st Baronet (age 23) was elected MP Grantham.

In 1820 Montague Cholmeley 1st Baronet (age 47) was elected MP Grantham which seat he held until 1826 when he retired in favour of his son Montague Cholmeley 2nd Baronet (age 17).

In 1868 Hugh Cholmeley 3rd Baronet (age 28) was elected MP Grantham.

In 1892 Henry Lopes 1st Baron Roborough (age 32) was elected MP Grantham.