About San Diego State University. San Diego State University in San Diego, CA reports an overall acceptance rate of 36.0%, an early-round acceptance rate of 36.0%, an SAT middle 50% of 1130–1340, a class size of 6,629, and a yield of 20.0% based on the most recent Common Data Set filings. Test-blind CSU campus with no EA/ED. Strong business, engineering, and health sciences. Largest and most selective CSU campus.