Newmarket has had an organized club, the Newmarket Baseball Club, since before 1880.  Volunteer citizens from the Town of Newmarket have been organizing baseball teams and games since 1950. 
 
One of the first youth baseball teams was formed to participate in the Royal Canadian Legion Peewee Tournament at the CNE Fairgrounds in 1956.  Newmarket is proud to have entered teams every year since.  The annual Legion CNE Peewee Baseball Tournament is the most prestigious and oldest event of its kind in the province for 12-13 year olds. Thirty-two teams from Toronto (TBA) and Southern Ontario (OBA) compete over nine days in a 31-game, single elimination event. Games take place at the CNE Ball Park at the west end of the grounds during the CNE.

Newmarket Baseball Association has hosted the prestigious Don McKnight Silver Bat Tournament for 11U teams (10-11 year olds) since 1975.  The tournament has hosted up to 32 teams from all over Canada and the USA. 

Francis Hollingsworth was the founder and honourary president from 1950 to 1959.  The Newmarket Baseball Association was formed in 1960, and was incorporated in 1986.  The typcal registration is just over 900 players.  A dedicated group of 10-15 volunteers are on the Executive Board, planning, scheduling, teaching and organizing the teams, coaches and umpires every year. Executive members are elected at the Annual General Meeting.

Past Presidents

1950-1959	Francis Hollingsworth	Registrations	?
1960	Lew Hewett	Registrations-	500
1961	Ollie Gould	Registrations-	500
1962	John Houlhahan	Registrations-	500
1963	Bill Vanzant	Registrations-	500
1964	John Readman	Registrations-	500
1965	Bill Pawson	Registrations-	450
1966	Bill Pawson	Registrations-	475
1967	Art Westlake	Registrations-	525
1968	Art Westlake	Registrations-	525
1969	Art Westlake	Registrations-	500
1970	Ken Wright	Registrations-	475
1971	Stu Dunham	Registrations-	500
1972	Stu Dunham	Registrations-	500
1973	Ray Sutherland	Registrations-	400
1974	John Lott	Registrations-	400
1975	John Lott	Registrations-	400
1976	Alex Grant	Registrations-	410
1977	Alex Grant	Registrations-	430
1978	Roy Green	Registrations-	497
1979	Don McKnight	Registrations-	444
1980	Don McKnight	Registrations-	439
1981	Don McKnight	Registrations-	435
1982	Don McKnight	Registrations-	418
1983	Don McKnight	Registrations-	400
1984	Jim Hundorf	Registrations-	438
1985	Ross Harrison	Registrations-	477
1986	Ross Harrison	Registrations-	649
1987	Rich Lunney	Registrations-	593
1988	Rich Lunney	Registrations-	621
1989	Rich Lunney	Registrations-	584
1990	Carr McLeod	Registrations-	633
1991	Carr McLeod	Registrations-	775
1992	Carr McLeod	Registrations-	913
1993	Carr McLeod	Registrations-	1093
1994	Carr McLeod	Registrations-	1237
1995	Carr McLeod	Registrations-	1118
1996	Larry Lake	Registrations-	958
1997	Larry Lake	Registrations-	902
1998	Dave Giroux	Registrations-	703
1999	Dave Giroux	Registrations-	714
2000	Dave Giroux	Registrations-	652
2001	Dave Giroux	Registrations-	648
2002	Karl Born	Registrations-	630
2003	Karl Born	Registrations-	525
2004	Ted Williams	Registrations-	560
2005	Ted Williams	Registrations-	597
2006	Ted Williams	Registrations-	645
2007	Ted Williams	Registrations-	797
2008	Tim Brown	Registrations-	899
2009	Tim Brown	Registrations-	842
2010	Tim Brown	Registrations-	833
2011	Catherine MacNeil	Registrations-	778
2012	Catherine MacNeil	Registrations-	814
2013	Catherine MacNeil	Registrations-	749
2014	Timothy Boswell	Registrations-	825
2015	Timothy Boswell	Registrations-	903
2016	Timothy Boswell	Registrations-	1127
2017	Timothy Boswell	Registrations-	1257
2018	Ted Williams	Registrations-	1128
2019	Ted Williams	Registrations-	996
2020	Ted Williams	Registrations-	693*
2021	Ted Williams	Registrations	655
2022	Doug Yarenko	Registrations	847
2023	Doug Yarenko	Registrations	929
2024	Doug Yarenko	Registrations	958
2025	Doug Yarenko	Registrations	1004