Federal law takes precedence unless state law offers a greater protection for the employee, in which case state law is controlling.
Federal law affects every company.
However, employers should contact their appropriate state department to check on current state requirements for their size and type of company. Alaska has laws which cover employers with more than 14 employees who must post a notice prepared by the state Commission for Human Rights. California employers must take action which ensures a workplace free of sexual harassment. Colorado has an Anti Discrimination Act which includes sexual harassment. Connecticut has a sexual harassment training law that affect employers with 50 or more employees and a requirement for postings that covers employers with over 2 employees.