18 states that require E-Verify does not mandate the use of E-Verify 18 states that require E-Verify varied. mandates Map of States Using mandates as it already is 10 or more employees use e-verify by 2013 Where E-Verify is currently mandatory or not-so mandatory 18 states that require E-Verify 20 states a map of other states limiting the use of E-Verify 20 states your states specific laws