Whitmore was the son of Sir William Whitmore of Apley and his second wife Dorothy Weld, daughter of John Weld of London. His father was High Sheriff of Shropshire in 1620, and elder brother of Sir George Whitmore(d1654), Lord Mayor of London.
He supported the Royalist side in the English Civil War. He was re-elected in November 1640 in the Long Parliament and held the seat until 1644 when he was disabled for supporting the King. He was created a baronet, of Apley, on 28 June 1641.
In February, 1645, Whitmore"s home Apley House was taken by the Parliamentarians, under Sir John Price.
Whitmore and his father, Sir Francis Oatley, Mr. Owen, and about sixty men, were captured.
Their estates and moveable property were sequestered by the county"s Sequestration Committee and they were held in confinement for a considerable time. Whitmore died at the age of 41.
Whitmore married Elizabeth Acton, daughter of Sir William Acton, 1st Baronet.
Sir William Whitmore, 2nd Baronet, who married Mary Harvey, and died without issue. Sir Thomas Whitmore, who married Honorary Frances Brooke, leaving issue.
Anne Whitmore, who married Sir Francis Lawley, 2nd Baronet, leaving issue.
Elizabeth Whitmore, who married John Bennet, leaving issue. Dorothy Whitmore, who married Eliab Harvey, leaving issue.
Short Parliament]
In April 1640, Whitmore was elected Member of Parliament for Bridgnorth for the Short Parliament.
