NBC vs TSC vs WAC: USCIS Service Centers Explained (2026)

My I-485 was processed at the National Benefits Center (NBC) — I know that because my receipt number starts with NBC. But when I first got that receipt notice, I had no idea what NBC meant, what it did differently from other centers, or whether it mattered. It turns out it matters quite a bit, depending on your form type. Here's what you need to know about each center.

How to Find Your Service Center

Look at the first three letters of your receipt number on your Form I-797 Notice of Action. That prefix tells you exactly which center is handling your case. The most common prefixes:

National Benefits Center (NBC)

NBC is the primary processing hub for family-based and employment-based I-485 (Adjustment of Status) cases. If you're on the path from H-1B to green card, there's a good chance your case is at NBC — mine was.

One important NBC-specific detail: USCIS instructs I-485 applicants with NBC receipt numbers to check their local Field Office processing times, not NBC's, because NBC frequently transfers cases to local offices for interview. This trips up a lot of people who compare their wait to NBC's published numbers when their case has already been transferred or is destined for Field Office processing.

NBC does have an interview waiver program for qualifying employment-based cases, which can significantly speed up the overall timeline by eliminating the Field Office step entirely.

Texas Service Center (TSC)

TSC handles a wide range of nonimmigrant petitions — H-1B, L-1, O-1, TN — as well as certain immigrant categories. It's one of the busiest service centers and has historically had longer processing times for some form types, though this varies by period and petition type. TSC also handles some I-140 petitions.

California Service Center (WAC)

WAC processes petitions primarily from employers and individuals in the western U.S., along with certain national categories. Like TSC, it handles H-1B and other employment-based nonimmigrant petitions. Processing times at WAC can differ meaningfully from TSC for the same form type, depending on current workload.

Vermont Service Center (EAC/VSC)

VSC handles cases primarily from the eastern U.S. and certain specialized categories. It processes H-1B, some I-140 categories, and various other petition types. Processing times here also fluctuate with workload.

Potomac Service Center (YSC)

YSC is a specialized center that handles high-priority employment-based categories including EB-1A (Extraordinary Ability), EB-1B (Outstanding Researcher), EB-2 NIW (National Interest Waiver), and certain other categories. It was established to streamline processing for these petition types.

Can You Choose Your Service Center?

Generally, no. USCIS assigns your case to a service center based on your form type, location, and internal workload distribution. You can't request a transfer to a faster center. USCIS may transfer cases between centers on its own if workload balancing requires it — this shows up as BA, BC, or BB codes in your event log.

Why Processing Times Differ Between Centers

Each center has its own staffing levels, specialty focus areas, and incoming caseload. A center that's fast for I-765 might be slow for I-140. Processing times are also based on a rolling 6-month average of completed cases, so recent changes in staffing or intake volume don't immediately show up in the published numbers.

The bottom line: there's no universally "fastest" service center. The only accurate source for current processing times at your specific center is the official USCIS processing times page, checked regularly.

What If Your Case Is Transferred?

If USCIS transfers your case, you'll see event codes in your log: BC (to Field Office for interview), BA (general relocation), BB (new jurisdiction), or BK1 (physical file from NBC to Field Office). After a transfer, update your processing time reference to the new center or office — the original center's published time no longer applies to your case.