I am not aware of any law that requires a nonprofit to post the names or addresses of its officers on its website. Nonprofits that file the Form 990 tax information return are required to list the names of their officers, directors and key employees and an address where they can be reached, but that address can be the address of the entity. Some organizations make a big mistake by just slapping the internal board list onto the Form 990 as an attachment, even though it includes home addresses, phone numbers, spouses’ and kids’ names, and other personal contact information. Since the Form 990 is a public document instantly available at www.guidestar.org and other places, that is a really bad idea.