I recently submitted my spouse I -539 for L2 to H4 status change, to the following address, USCIS Dallas Lockbox Facility
For U.S. Postal Service (USPS):
USCIS
PO Box 660921
Dallas, TX 75266
But in the forum I see people talk about processing center. Should I need to post it specific processing center?
File with the USCIS Dallas Lockbox Facility if the receipt number of your H-1B principal spouse’s most recent Form I-797 Notice of Approval for Form I-129 begins with EAC or LIN .
Regards
Tiruka