Jefferson County has 31,432 registered voters, according to Illinois voter registration records.

Johnson County has 8,833 registered voters, according to Illinois voter registration records.

Livingston County has 24,738 registered voters, according to Illinois voter registration records.

Massac County has 15,014 registered voters, according to Illinois voter registration records.

Pope County has 3,170 registered voters, according to Illinois voter registration records.

Pulaski County has 4,373 registered voters, according to Illinois voter registration records.

Saline County has 16,156 registered voters, according to Illinois voter registration records.

Union County has 15,040 registered voters, according to Illinois voter registration records.

Wabash County has 9,147 registered voters, according to Illinois voter registration records.

Wayne County has 12,641 registered voters, according to Illinois voter registration records.

White County has 11,109 registered voters, according to Illinois voter registration records.

Williamson County has 48,428 registered voters, according to Illinois voter registration records.