http://www.ncsl.org/research/about-state-legislatures/chart-of-term-limits-states.aspx
House Senate
State Year Enacted Limit Year of Impact Limit Year of Impact % Voted Yes
MAINE 1993 8 1996 8 1996 67.6
CALIFORNIA 1990 12 (c) 1996 12 (c) 1998 52.2
COLORADO 1990 8 1998 8 1998 71
ARKANSAS 1992 6 1998 8 2000 59.9
MICHIGAN 1992 6 1998 8 2002 58.8
FLORIDA 1992 8 2000 8 2000 76.8
OHIO 1992 8 2000 8 2000 68.4
SOUTH DAKOTA 1992 8 2000 8 2000 63.5
MONTANA 1992 8 2000 8 2000 67
ARIZONA 1992 8 2000 8 2000 74.2
MISSOURI (a) 1992 8 2002 8 2002 75
OKLAHOMA 1990 12 (c) 2004 12 (c) 2004 67.3
NEBRASKA 2000 n/a n/a 8 2006 56
LOUISIANA 1995 12 2007 12 2007 76
NEVADA (b) 1996 12 2010 12 2010 70.4
(a) Because of special elections, term limits were effective in 2000 for eight current members of the House and one Senator in 1998.
(b) The Nevada Legislative Council and Attorney General ruled that Nevada's term limits could not be applied to those legislators elected in the same year term limits were passed (1996). They first applied to persons elected in 1998.
(c) In California and Oklahoma, a legislator may serve a total of 12 years in the legislature during his or her lifetime. The total time may be split between the two chambers, or spent in its entirely in a single chamber. Before 2012, California's limits were identical to those in Arkansas: six years in the assembly and eight years in the senate.