In 1156 Richard "The Loyal" Lucy (age 67) was appointed High Sheriff of Essex and High Sheriff of Hertfordshire.

In 1160 William Beauchamp 1st Baron Beauchamp (age 55) was appointed High Sheriff of Hertfordshire.

In 1192 William de Braose 4th Baron Bramber (age 48) was appointed High Sheriff of Hertfordshire.

In 1199 Walter Clifford 2nd Baron Clifford (age 39) was appointed High Sheriff of Hertfordshire.

In 1207 Walter Clifford 2nd Baron Clifford (age 47) was appointed High Sheriff of Hertfordshire.

In 1216 Walter Clifford 2nd Baron Clifford (age 56) was appointed High Sheriff of Hertfordshire.

In 1218 Walter Lacy Lord Meath (age 52) was appointed High Sheriff of Hertfordshire.

In 1221 Stephen Segrave (age 50) was appointed High Sheriff of Hertfordshire and High Sheriff of Essex.

In 1376 John Devereux 1st Baron Devereux (age 39) was appointed High Sheriff of Hertfordshire.

In 1470 William Denny (age 47) was appointed High Sheriff of Hertfordshire.

In 1533 Philip Boteler (age 41) was appointed High Sheriff of Hertfordshire.

In 1536 Henry Parker (age 23) was appointed High Sheriff of Essex and High Sheriff of Hertfordshire.

In 1540 Philip Boteler (age 48) was appointed High Sheriff of Hertfordshire.

In 1540 John Mordaunt 2nd Baron Mordaunt (age 32) was appointed High Sheriff of Hertfordshire.

In 1557 Thomas Pope (age 50) was appointed High Sheriff of Hertfordshire.

In 1566 John Brocket was appointed High Sheriff of Hertfordshire.

In 1593 John Leventhorpe 1st Baronet (age 33) was appointed High Sheriff of Hertfordshire.

In 1603 Edward Denny 1st Earl Norwich (age 33) was appointed High Sheriff of Hertfordshire.

In 1607 John Leventhorpe 1st Baronet (age 47) was appointed High Sheriff of Hertfordshire.

In 1626 John Jennings was appointed High Sheriff of Hertfordshire.

In 1655 John Reade 1st Baronet (age 39) was appointed High Sheriff of Hertfordshire.

In 1673 John Reade 1st Baronet (age 57) was appointed High Sheriff of Hertfordshire.

In 1690 John Garrard 3rd Baronet (age 52) was appointed High Sheriff of Hertfordshire.

In 1693 James Reade 2nd Baronet (age 37) was appointed High Sheriff of Hertfordshire.

In 1878 Thomas Fowell Buxton (age 55) was appointed High Sheriff of Hertfordshire.

In 1939 Cecil Gustavus Jacques Neumann aka Newman 2nd Baronet (age 47) was High Sheriff of Hertfordshire.