Governor Olson appointed the first Board of Directors: George M. Stark, Jay T. Norman, Daniel Kleiman, Stanley Fiske, James W. Warford, Ray M. Sullivan and E.O. Sumner. 

George W. Robinson was appointed to act as the first Secretary-Treasurer and was paid $150 for his services from May through December 1939. 

J.M. Loyd of Auburn was retained as the manager of the first annual county fair. His compensation for managing the fair, performing the auditing work and preparing the 1940 budget was set at $500. 
 

Wilbur White was hired as the grounds superintendent for the first annual fair and was compensated $11 per day plus reasonable and necessary expenses.

Planning for the first annual Mariposa County was underway. In two short weeks, the event was planned and organized and opening day arrived. 

• The first premium list for exhibits was prepared offering $6,558.25 in cash prizes for Horse Show, Livestock, Poultry/Rabbits, Community Booths, Agriculture, Horticulture, Domestic Science, Bees and Honey, Lumber, Minerals and Future Farmers of America.

• A committee chaired by A. C. McDonald organized an amateur rodeo.

• An entertainment committee was appointed to work out suitable arrangements for the fair's program. Daniel Klieman, Thomas L. Graham, Ruth Womack, J.L. Spriggs, Ramona Eckern, Margaret Black, and C.K. Dennis.

• The "Distinguished Guests Banquet" was organized by J.J. Castegnetto, John L. Dexter and Schottky.

• Electricians engaged in "fair" work were paid 90 cents per hour and the electrician helpers were paid 75 cents per hour.

• The first annual Mariposa County Fair receipts were $3,411.35 and expenses totalled $9,103.00.

A special meeting of the Board of Directors was called to consider renting the fairgrounds for an interim (non fairtime) event. 

• The planning and preparation for today's fair is a year round effort.
• Premiums offered for exhibits at the 1999 fair totaled more than $38,000. for 36 different exhibit categories.
• The Rodeo is CCPRA (California Cowboys Professional Rodeo Association).
• Entertainment for the fair costs over $25,000.00.
• The annual fair of today earns over $200,000. in receipts and the expenses for the event are at least that amount, if not more.
• Hundreds of events are held year around on the fairgrounds.

1939-1970    -   Stanley Fiske
1939-1962    -   Daniel Kleiman 
1939-1959    -   John Grosjean
1939-1956    -   E.O. Sumner 
1939-1945    -   George M. Stark 
1939-1948    -   Jay T. Norman 
1939-1947    -   Ray Sullivan 
1939-1947    -   James Warford
1945-1965    -   Richard Morrisey 
1947-1959    -   Richard Starns 
1947-1950    -   Ulin C. Marrs 
1948-1963    -   W. Blaine Sturtevant 
1950-1959    -   Frank B. Ewing 
1956-1968    -   Lilburn E. Schatz 
1959-1967    -   George Gordo 
1959-1967    -   Lynn Gunther 
1960-1968    -   Harold Trabucco 
1962-1969    -   Glenn Binning 
1962-1969    -   Sydney Legare 
1964-1982    -   Laverne "Der" Greeley 
1965-1975    -   E. F. "Dutch" Reynolds 
1967-1975    -   Louie Erickson 
1967-1975    -   Helen Callan 
1968-1991    -   W.W. "Walt" Stroming 
1968-1980    -   B.H. "Bob" Hill 
1969-1973    -   Clair Wolfsen 
1969-1973    -   Ed Robertson 
1970-1976    -   Jack D. "Scott" Pinkerton 
1973-1994    -   Walter E. Palmer 
1974-1981    -   Mark Long 
1976-1993    -   Betty Gordo 
1975-1979    -   James E. Honea 
1975-1987    -   Helen Hopper
1974-1990    -   Daniel Martinez 
1982-1984    -   John Shimer 
1985-Current -   James L. "Lowell" Munn 
1987-1995    -   Joyce Barrett 
1987-1992    -   Garry Parker 
1979-1987    -   Tim Binning 
1981-1998    -   Delbert "Ace" Harmon 
1980-1992    -   Della Hern 
1990-1994    -   Charlene Stormberg 
1992-1999    -   Cathie Ragghianti
1992-1997    -   R.W. Rosebrock, DVM 
1992-Current -   C.A. "Pelk" Richards 
1993-Current -   Noma Moore 
1994-1998      -   Jonathan F. Turner 
1994-1997      -   Suzan Banchero 
1995-2002      -   Roy Chapline 
1998- 2002     -   Wayne Forsythe 
1998-1998      -   Robert Stonum 
1999- 2002     -   Scott Duffin 
1999- 2002     -   Dieter Dubberke 
1999- 2002     -   Jan Mennig, PhD 
2002 - 2007    -   Jennifer Binning 
2002 - 2007    -   Jery Lacayo 
2002-Current -   Stuart Tanner
2002-Current -   Charles Wildt
2002-Current -   Mary Williams
2007-Current -   Dottie Ducret
2007-Current -   Lester Bridges
2007-Current -   Tom Williams

FAIRGROUNDS MANAGERS since 1939:

1939            -   J.M. Loyd (manager/fair only) 
1939-1942    -   George W. Robinson (secretary-treasurer) 
1941-1948    -   Dale Campbell 
1948-1950    -   J.T. Norman 
1950            -   Stanley Fiske (acting manager) 
1950-1961    -   Dale Campbell 
1962-1968    -   Dan Kleiman 
1969            -   Nancy Ringrose (acting manager - January to May)
1969-1976    -   Mathilde "Tillie" Stroming
1976-1979    -   Scott Pinkerton 
1980-1982    -   Mary Kingsley 
1982-1990    -   Mary Clubb 
1990-2003    -   Linda K. Sinclair 
2004-current    Brian Bullis