Question: Which posters have to be posted where "applicants" as well as employees can see them?

Answer:

Generally, federal workplace posters must be displayed or posted in conspicuous places where they are easily visible to all employees — the intended audience. The FMLA, EEO, and EPPA posters are also required to be placed where they can be seen by applicants for employment.

• The Family and Medical Leave Act (FMLA) Poster must be displayed in a conspicuous place where employees and applicants for employment can see it. If an employer is covered by the FMLA, a poster must be displayed at all locations, even those where there are no FMLA eligible employees.
• "Know Your Rights" Poster must be posted in conspicuous places available to employees and applicants for employment. Federal contractors and subcontractors covered by Executive Order 11246 must also post the notice where it can be readily seen by representatives of each labor union with which the covered contractor or subcontractor has a collective bargaining agreement.
• The Employee Polygraph Protection Act (EPPA) Poster must be posted in a prominent and conspicuous place in every establishment of the employer where it can readily be observed by employees and applicants for employment.