Summary:
Illinois has 19 representatives, 12 Democrats and 7 Republicans.
Indiana has 9 representatives: 5 Democrats and 4 Republicans.
Iowa has 5 representatives: 3 Democrats and 2 Republicans.
Kansas has 4 representatives: 1 Democrat and 3 Republicans.
Vulnerable are
IL-06 (R)
IL-10 (R)
IL-11 (D)
IL-14 (D)
IN-02 (D)
IN-08 (D)
IN-09 (D)
IA-03 (D)
KS-04 now open but was (R)