An audit of the USPS shows that Chicago has the worst overnight mail delivery in the country. From the Chicago Tribune:

The audit found that first-class mail sent between Chicago ZIP codes made it to the correct address the next day 91 percent of the time. The cities that fared best in the audit had deliver rates of around 97 percent.

The audit was for mail delivered between June and September of last year.

U.S. Rep. Danny Davis (D-Chicago), who heads a congressional subcommittee that oversees the Postal Service, said he has urged officials to do whatever they can to fix the delivery problems in Chicago.

Audit: Chicago mail delivery the worst [Chicago Tribune]
(Photo: kim_scarborough)