For the clerkship year that’s just ending, the Ninth Circuit Clerk of Court’s office reports that it’s 73 men and 73 women.
UPDATE: Just to clarify, these are “elbow clerks,” who are hired by each individual judge to work for him or her, rather than “staff attorneys,” who are hired by the court to perform somewhat different roles than the elbow clerks serve. My sense is that to most people “clerk” means “elbow clerk,” and staff attorneys are called staff attorneys; but some commenters asked about this, so I thought I’d note it.