UnitedStatesZipCodes.org has released the zip codes across Illinois that have the highest and lowest median household incomes. Here's the list of the highest and lowest.
Highest:
1) 60045 Lake Forest - $176,108
2) 60093 Winnetka - $173,919
3) 60521 Hinsdale - $166,936
4) 60558 Western Springs - $150,880
5) 60091 Wilmette - $148,462
Lowest:
1) 62523 Decatur - $11,091
2) 60201 East St Louis - $16,611
3) 62207 East St Louis - $16,751
4) 62204 East St Louis - $19,212