Attendance
Accounting for my own possible error, since Horrell gives just slightly different numbers in his own research, the following is what I found based off of the surviving minute books starting in 1749 and cards indexing the justices of the Fairfax County Court present each time they met.
The Court met 54 times from 1749 to when Mason got kicked off on April 30 1752. The Fairfax County Court was reduced from twenty-two justices to ten and Mason was among the dozen kicked off in 1752. However, by 1757, the Fairfax County Court was made up of eighteen justices. By 1761, there were twenty-three.[1]
The ten justices remaining on the Fairfax County Court were John Colvill, Lewis Ellzey, George William Fairfax, Stephen Lewis, Lawrence Washington, John West, John Carlyle, William Ramsay, Charles Broadwater, and Anthony Russell. Daniel McCarty rejoined before the year was out.[2]
The Court met 44 times from when Mason rejoined in November 1764 to May 1766. Rejoining did not cost him his seniority, as it counted from a justice's earliest date of service, regardless of absence.
The Court met 149 times from 1768 through 1772.
The Court met 32 times from June 1786 to May 1784.
[1] Joseph Horrell, “George Mason and the Fairfax Court,” The Virginia Magazine of History and Biography 91, no. 4 (1983): 424.
[2] H. R. McIlwain, “Fifth Volume” in Executive Journals of the Council of Colonial Virginia, (Richmond: Virginia State Library, 1925-1966): 390.
1749 to 1752 [1]
Charles Broadwater: 37
John Covill: 34
Daniel McCarty: 25
William Henry Terrett: 24
John Carlyle: 23
William Ramsay: 22
Stephen Lewis: 21
Moses Linton: 18
John Minor: 17
John West: 17
Thomas Lord Fairfax: 15
George William Fairfax: 12
Anthony Russell: 11
Catesby Cocke: 10
William Payne: 9
Joseph Watkins: 8
Lewis Ellzey: 7
Lawrence Washington: 7
Richard Osborn: 5
Daniel Jennings: 4
Jeremiah Bronaugh: 3
George Fairfax: 3
George Mason: 3
1764 to 1766 [2]
John Carlyle: 39
William Adams: 33
Daniel McCarty: 25
Alexander Henderson: 25
Charles Broadwater: 26
John West: 21
George William Fairfax: 20
Hector Ross: 18
Benjamin Grayson: 17
William Payne: 15
Sampson Darrell: 12
Edward Blackburn: 11
George Mason: 10
John West Jr: 7
Robert Adam: 5
Richard Sanford: 1
William Payne Jr: 1
1768 to 1772 [3]
John West: 111
Daniel McCarty: 99
John Carlyle: 99
Alexander Henderson: 96
Charles Broadwater: 94
William Payne: 87
William Ramsay: 84
Sampson Darrell: 70
Bryan Fairfax: 64
George Washington: 51
John West Jr: 44
Edward Payne: 39
Henry Gunnell: 38
Hector Ross: 37
Robert Adam: 19
George Mason: 16
William Adams: 6
Thomas Lord Fairfax: 2
George Broadwater: 1
1783 to 1784 [4]
Robert McCrea: 30
William Ramsay: 26
Daniel McCarty: 21
Alexander Henderson: 12
John Gibson: 9
George Gilpin: 9
James Hendricks: 9
Hector Ross: 9
Charles Little: 8
Charles Broadwater: 7
Josiah Watson: 7
Robert T. Hooe: 6
Edward Payne: 6
Robert Adam: 5
Richard Chichester: 5
James Wren: 4
Henry Darne: 3
Thomas Lewis: 3
George Mason: 3
David Arell: 2
William Payne: 2
Charles Alexander: 1
David Stuart: 1
[1] Fairfax County Historical Records Center, Order Book, 1749-1754. Fairfax County Circuit Court, 1754.
[2] Fairfax County Historical Records Center, Order Book, 1763-1765, Fairfax County Circuit Court, 1765. The years 1763-1768 is actually a gap that is filled by a record book filled in with the clerk’s minutes, roughly, and is stored in the Huntington Library in San Marino, California. It is available to view on microfilm.
[3] Fairfax County Historical Records Center, Order Book, 1768-1774, Fairfax County Circuit Court, 1774.
[4] Fairfax County Historical Records Center, Order Book, 1783-1792, Fairfax County Circuit Court, 1792.