| State | ||||||||
| Number of Registered Voters | ||||||||
| Source: Office of the Secretary State | ||||||||
| 1994 | 1996 | 1998 | 2000 | 2002 | 2004 | 2006 | 2008 | |
| Region 1 | 84295 | 96808 | 91983 | 101732 | 95805 | 114375 | 108394 | 124088 |
| Region 2 | 59645 | 63849 | 60944 | 65539 | 59811 | 67185 | 60118 | 68683 |
| Region 3 | 77696 | 87174 | 84971 | 93886 | 90323 | 105749 | 104809 | 117440 |
| Region 4 | 164582 | 192942 | 182666 | 203693 | 189547 | 230547 | 213969 | 257040 |
| Region 5 | 79921 | 86764 | 78388 | 83721 | 75779 | 87010 | 84632 | 90641 |
| Region 6 | 79083 | 83734 | 79209 | 87136 | 82516 | 92938 | 85473 | 93113 |
| Region 7 | 80581 | 89159 | 83272 | 92378 | 85754 | 100211 | 95866 | 104789 |
| * Population 18 years and over | ||||||||
| * This data is for the general elections of the reported years. | ||||||||