MP Northamptonshire is in Member Parliament.
In February 1324 Richard Willoughby [aged 34] was elected MP Northamptonshire.
In 1394 Henry Green of Drayton, Northamptonshire [aged 47] was elected MP Northamptonshire.
Before September 1397 Henry Green of Drayton, Northamptonshire [aged 50] was elected MP Northamptonshire.
In 1410 John St John [aged 48] was elected MP Northamptonshire.
In 1411 John St John [aged 49] was elected MP Northamptonshire.
In March 1416 John St John [aged 54] was elected MP Northamptonshire.
In May 1421 John St John [aged 59] was elected MP Northamptonshire.
In 1445 Thomas Billing was elected MP Northamptonshire.
In 1453 Thomas Tresham [aged 33] was appointed MP Northamptonshire.
In 1459 Thomas Tresham [aged 39] was appointed MP Northamptonshire.
In 1467 Thomas Tresham [aged 47] was appointed MP Northamptonshire.
On 7th November 1485 Thomas Lovell was elected MP Northamptonshire.
On 17th February 1554 Thomas Tresham [aged 54] was appointed MP Northamptonshire.
On 3rd October 1554 Thomas Tresham [aged 54] was appointed MP Northamptonshire.
In 1604 Edward Montagu 1st Baron Montagu [aged 41] was elected MP Northamptonshire.
In 1621 Richard Knightley [aged 27] was elected MP Northamptonshire.
In 1656 William Wray 1st Baronet [aged 31] was elected MP Grimsby during the Second Protectorate Parliament.
William Wyndham 1st Baronet [aged 24] was elected MP Somerset during the Second Protectorate Parliament.
Thomas Crew 2nd Baron Crew [aged 32] was elected MP Northamptonshire during the Second Protectorate Parliament.
Francis Bacon [aged 55] was elected MP Ipswich in the Second Protectorate Parliament.
In 1661 Justinian Isham 2nd Baronet [aged 51] was elected MP Northamptonshire.
In 1679 William Langham 3rd Baronet [aged 48] was elected MP Northamptonshire which seat he held until 1695.
On 13th June 1689 Thomas Samwell 1st Baronet [aged 35] was elected MP Northamptonshire which seat he held until 1690.
In 1748 Valentine Knightley [aged 29] was elected MP Northamptonshire.
On 21st November 1763 Lucius Knightley [aged 21] was elected MP Northamptonshire.
After 11th March 1768 William Dolben 3rd Baronet [aged 41] was elected MP Northamptonshire which seat he held until 1774.
On 14th January 1773 Lucius Knightley [aged 30] was elected MP Northamptonshire.
In 1774 George Robinson 5th Baronet [aged 43] was elected MP Northamptonshire.
In 1774 Lucius Knightley [aged 31] was elected MP Northamptonshire.
In 1780 Lucius Knightley [aged 37] was elected MP Northamptonshire.