| Population of county: | 5.4 million (second largest in nation) 109,000 in unincorporated area (2000 census) |
| Square miles of county: | 954 |
| County established in: | 1831 |
| County named after: | John Pope Cook, an Illinois congressman |
| Number of Employees: | 6,800 (5,600 sworn) |
| Educational requirements: | High school graduates / GED |
| Specialized Units: | Special Response Teams (police and corrections) Vice Unit Gang Crimes/Narcotics Unit K-9 Unit (police and corrections) Bomb Unit |
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