What do the receipt letters mean?

[Skyman 323]

I've notice most receipt numbers seem to start with MSC but ours both (I-485 and I-130) start with IOE.  The I-130 was done online in September while the I-485 was sent by mail in December but has the same priority date in September as the I-130.  Does anyone have a clue to what the different numbers (letters) mean?

[HRQX 4,145]

6 minutes ago, Skyman said:

both (I-485 and I-130) start with IOE.

"Integrated Operating Environment"

8 minutes ago, Skyman said:

Does anyone have a clue to what the different numbers (letters) mean?

Not much. I assume your I-485 receipt still says "National Benefits Center" in the bottom left hand side.

[Skyman 323]

8 hours ago, HRQX said:

I assume your I-485 receipt still says "National Benefits Center" in the bottom left hand side.

The I-130 which I sent online in September has the Texas Service Center and the I-485 (sent in December) receipt says it will be handled by the Nebraska Service Center. 

[Villanelle 4,122]

Service Center (WAC 16 012 50960)
Every receipt number begins with three letters that represent the service center that received the case. There are several codes for USCIS service centers. They include:

CSC – California Service Center
EAC – Eastern Adjudication Center (now known as Vermont Service Center)
IOE – ELIS (efile)
LIN – Lincoln Service Center (now known as Nebraska Service Center)
MSC – Missouri Service Center (now known as National Benefits Center)
NBC – National Benefits Center
NSC – Nebraska Service Center
SRC – Southern Regional Center (now known as Texas Service Center)
TSC – Texas Service Center
VSC – Vermont Service Center
WAC – Western Adjudication Center (now known as California Service Center)

Fiscal Year (WAC 16 012 50960)
The second set of digits represent the fiscal year that the case was received. Government agencies use a fiscal year that is different from the calendar year. It begins on October 1 and ends on September 30. So our example case number was opened between October 2016 and September 2016.

Computer Workday (WAC 16 012 50960)
The third set of digits indicates the computer workday that the case was opened. The computer workday is basically the same thing as a workday. Therefore it excludes most weekends and holidays. Our example case was opened on the 12th workday of the 2016 fiscal year (October 18, 2016).

Case Number (WAC 16 012 50960)
The final set of five digits is the case number.