OIE highly recommends using some form of delivery tracking in order to provide you with confirmation of the delivery date to USCIS prior to receiving the USCIS receipt notice.
We have been seeing delays in receipt notice processing lately, and a confirmation from the delivery service will allow you to verify that the package was delivered in a timely manner.
US Postal Service (Regular Mail) Deliveries:
NOTE: This method will not provide tracking unless you make a request at the post office.
P.O. Box 805373
Chicago, IL 60680
For USPS Express Mail, USPS Priority Mail and Private Courier (FedEx, UPS, DHL) Deliveries:
Attn: I-765 C03
131 South Dearborn - 3rd Floor
Chicago, IL 60603-5517
OIE has been informed that cases already received at the previous (Texas) address will be worked as normal, although they are running about a month behind on receipting. Applications received by the Dallas center in the future will either be forwarded to Chicago or processed in Dallas.