The median annual wage for Detectives and Criminal Investigators in Illinois is $89,740 (May 2024 BLS OES). The mean (average) is $97,900.
Pay spans roughly $53,600 at the 10th percentile to $158,720 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $43.14 per hour. An estimated 3,100 people work as detectives and criminal investigators in Illinois.
| Median (annual) | $89,740 |
| Mean (annual) | $97,900 |
| Median (hourly) | $43.14 |
| 10th percentile | $53,600 |
| 90th percentile | $158,720 |
| Employment | 3,100 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.