YC Companies · 3 min read

Where Is Y Combinator Located?

Short answer

Y Combinator's headquarters is in Mountain View, California (320 Pioneer Way). The 3-month batch program is run in San Francisco, where accepted founders are expected to relocate. YC started in Cambridge, Massachusetts in 2005 and moved permanently to Silicon Valley in 2009.

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Current headquarters

Y Combinator is headquartered at 320 Pioneer Way, Mountain View, CA 94041. The office hosts the partner team, alumni events, and the famous Tuesday dinners during batch.

Where the batch happens

Since 2024, the YC batch has been run in-person in San Francisco. Founders are expected to relocate to the Bay Area for the 3-month program — this is non-negotiable for full-time founders.

History of locations

  • 2005: Cambridge, Massachusetts (Summer Founders Program at Harvard).
  • 2006–2008: Split batches between Cambridge (summer) and Mountain View (winter).
  • 2009: Consolidated to Mountain View, California — permanent HQ.
  • 2020–2023: Fully remote batches during COVID.
  • 2024–present: Back to in-person, now run primarily in San Francisco.

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FAQ

Frequently asked questions

Do I have to move to SF for YC?
Yes. Since 2024, all batch founders must be in San Francisco for the 3-month program. YC will help with visas (B-1 for international founders).
Is the YC office open to the public?
No. The Mountain View office is private — alumni, current batch founders, and partners only.
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An independent resource · Not affiliated with Y Combinator · Last updated 2026-06-01