Internal Security Investigator salary at State Police of Illinois

The average internal security investigator salary at State Police of Illinois was $92,551 , which is 2 percent higher than the average salary for this job in Illinois, and 2 percent higher than the national average for this job . Internal Security Investigator salaries at State Police of Illinois typically range from $75,255 to $108,083 (25th to 75th percentile). The highest reported internal security investigator salary was $128,978. There are 27 employees at State Police of Illinois with the job title internal security investigator.