USCIS Receipt Number Prefixes Explained: EAC, WAC, SRC, LIN, MSC, IOE
Every USCIS filing gets a receipt number - a 13-character code that tells you exactly which service center is handling your case and gives you a way to track its status. The three-letter prefix is the most important part: it identifies the processing location and helps you understand typical processing times for your specific service center. This guide decodes every USCIS receipt number prefix and explains what each one means for your H-1B, green card, or other immigration filing.
Frequently asked questions
What does SRC stand for in a USCIS receipt number?
SRC stands for Southern Regional Center - the code USCIS uses for the Texas Service Center. The prefix predates the current service center name; the "S" stands for Southern (Texas is in the southern US), not for the state of Texas. Cases with SRC are processed at the Texas Service Center in Irving, Texas. SRC cases include H-1B petitions, H-4 EAD applications, I-485 adjustment of status, and many other immigration filings.
What does EAC mean on a USCIS receipt number?
EAC stands for Eastern Adjudication Center - the code for the Vermont Service Center in St. Albans, Vermont. EAC cases include H-1B petitions, I-140 immigrant petitions, and I-485 adjustment of status applications. Vermont is one of the primary service centers for employment-based immigration filings, including many H-1B cap-subject petitions.
How do I track my H-1B case using the receipt number?
Go to egov.uscis.gov/casestatus and enter your full 13-character receipt number from your I-797 notice. The system shows the current status and any recent updates. For more detail, sign up for case status email notifications through your USCIS online account. Current processing times for your service center (identified by your prefix) are available at uscis.gov/processing-times.
Disclaimer: This article is for informational purposes only and does not constitute legal advice. Immigration law is complex and situation-specific. Always consult a licensed immigration attorney before making decisions about your immigration status.