The Arizona League is a Rookie Class minor league which began operation in 1988 and is still functioning
'Arizona' (Rookie 1988+)
“Arizona”: 1996-2000, 2011+
Boston/Seattle: 1988
“California”: 1989-96
ChicagoA: 1997, 2000-02
ChicagoN: 1997+
Cincinnati: 2010+
“Colorado”: 1993-2000
Kansas City: 2003+
Los Angeles(A): 2001+
Los Angeles(N): 2009+
“Mexican All-Stars”: 1998
Milwaukee: 1988-95, 2001+
Montreal: 1991
Oakland: 1988+
St Louis: 1988-94
San Diego: 1988-2000, 2004+
San Francisco: 1991-94, 2000+
Seattle: 1989+
'Texas': 2003+