Where to send ead application? You have to send a postal application to the USCIS lockbox address. USCIS forwards your H4 EAD application internally to other centers from Dallas or Phoenix themselves. You do not need to worry about it.Where to send h4 ead application? Your primary H1B’s receipt number should start with WAC or SRC to send the H4 EAD application to the USCIS Phoenix Lockbox office. WAC refers to California Service Center. SRC is Texas service center. #1 Sending by USPS postal mailHow can i change my usps mailing address? To change Mailing address, you need to go to post office. Pick up the mover’s guide and follow the instruction. You need to fill the PS Form 3575.Where to send form i 765? If you are filing your Form I-765 through the U.S. Postal Service, you must mail to USCIS, PO Box 650888, Dallas, TX 75265-0888.