USCIS service centers and receipt prefixes

USCIS assigns the service center and you cannot influence it. Allocation depends on the form type, the category and the filing address; inside the center the case reaches a particular desk through an internal queue. You can neither pick a center nor ask for a transfer.

The advice to "file from another state to land at the lenient center" does not work in practice: the filing address is set by the form instructions, not by preference, and bending it creates a discrepancy with your other documents - one more reason for questions.

Our data cannot say which center is stricter, and that is worth stating plainly. The set consists of cases that already drew an RFE, a NOID or a denial; petitions approved without a single question are absent from it entirely. A center adjudicating twice as many cases will have twice as many problem ones at exactly the same level of strictness.

What genuinely differs is the wording. Different desks take the same criterion apart differently: one presses on membership regularly, another on high salary. The four-digit officer number in the corner of a notice identifies such a desk, not a person, and it shows which criteria that desk challenges most often. That is the only practically useful thing "who is adjudicating" yields, and it helps when preparing a response to a request you already have.