Employers with 15 or more employees must comply with Title I of the ADA, the Federal civil rights law for people with disabilities. Both full-time and part-time employees are counted in determining whether a public accommodation/private business is covered by Title I. All state and local governments no matter how many employees they have - must not discriminate on the basis of disability in their hiring and employment practices and must provide reasonable accommodation to qualified applicants and employees with disabilities.
Many states have laws or ordinances comparable to Title I to not discriminate against applicants or employees with disabilities. Many of these state laws and ordinances apply even when an employer has fewer than 15 employees, which differs from the federal requirement. For example, both Massachusetts’ law and New Hampshire's law apply to small businesses with six or more employees. Vermont’s law and Maine’s law both apply to employers with one or more employees. Connecticut’s law applies to employers with three or more employees.
Below are sample ADA questions from an employer.