Counties Served: Bond, Clinton, Calhoun, Greene, Jersey, Macoupin, Madison, Montgomery, Monroe, St. Clair, and Washington

Troop 8 encompasses Bond, Clinton, Calhoun, Greene, Jersey, Macoupin, Madison, Montgomery, Monroe, St. Clair, and Washington counties. Headquarters are located in Collinsville and Litchfield. The primary function of Troopers in Troop 8 is to patrol interstates I-55, I-64, I-255, and I-270, and many rural/unincorporated areas throughout the counties. In addition to normal patrol functions, ISP Troopers work throughout the Troop addressing gun and drug trafficking within local communities and on the interstates. ISP responsibilities include traffic enforcement, criminal patrol, commercial motor vehicle enforcement, and assisting the public on Illinois roadways.

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