USCIS receipt-number prefix lookup
A USCIS receipt number is three letters + ten digits. The three-letter prefix identifies the service center or system that is handling the case.
IOE
USCIS Electronic Immigration System (ELIS)
Online filings
EAC
Vermont Service Center
Vermont
WAC
California Service Center
California
LIN
Nebraska Service Center
Nebraska
SRC
Texas Service Center
Texas
MSC
National Benefits Center
Nationwide adjudication support
NBC
National Benefits Center
Nationwide
YSC
Potomac Service Center
Virginia
NSC
Nebraska Service Center
Nebraska
CSC
California Service Center
California
TSC
Texas Service Center
Texas
VSC
Vermont Service Center
Vermont
MCT
California Service Center
California