On the page below, you'll notice that the last two ping-tests don't gow up with a location in the state. Both are in DuPage County. The one under my name is in Oak Brook 60523. The other, belonging to insomniac
is one of 60540, 60563, or 60565-60567.
I ran through several zip codes in DuPage, and none of them mapped correctly, so I'm thinking a table is broken somewhere.
I tested 60523, 60191, and one of the zip codes for Naperville display on this page. All had the same issue, but moving to the next county south, Will County, zip codes mapped.
Hardly a high priority, but probably an easy fix.