Webbet it further ordained, that the cook county board of commissioners recognizes and approves the salary increases for each county elected official commensurate with. The average employee salary for cook county, illinois in 2023 was $91,923. There are 59,309 employee records for cook county, il. Employee payroll data for all cook county employees excluding forest preserves, indicating amount of base salary paid to an employee during the county. Webin 2023 cook county, illinois reported 6,311 employees making more than $100,000 per year; The average salary was $91,923. The highest reported pay for the county was. Webthe cook county board of commissioners voted tuesday to give themselves and other top county officials a 10% bump in pay during the next term, but.