If you don't see the person you're looking for on a Class List, try the Search Classmates® feature at the top right of any page, where you can search by first and last name, and school or state.
If you still don't find the person you're looking for, it's possible that they haven't yet registered with Classmates. Keep in mind that the names listed reflect registered members only. You can still check back often, though. New people register every day!