What is the smallest campus in csu?

Determining the "smallest" CSU campus depends on what metric you're using: student population, physical size (acres), or something else. There's no single definitive answer.

However, some of the consistently smaller CSU campuses in terms of student population often include CSU Monterey Bay and CSU Channel Islands. Their physical size is also relatively smaller compared to some of the older, larger campuses. To be certain, you'd need to check the official CSU website for the most up-to-date enrollment and campus acreage figures.