Counties Served: Boone, Cook, DeKalb, Grundy, Kane, Kendall, Lake, McHenry, and Will

Troop 3 encompasses Boone, Cook, DeKalb, Grundy, Kane, Kendall, Lake, McHenry, and Will counties. Headquarters are located in Des Plaines, Elgin, and Joliet. The primary function of Troopers in Troop 3 is to patrol interstates I-55, I-80, I-57, I-355, I-290, IL-53, 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.

Tollways Served: Tri-State I-94, I-294, and I-80; Reagan Memorial I-88; Jane Adams Memorial I-90; Veterans Memorial I-355; and Illinois Route 390 Tollway

ISP patrols the following roadways and facilities, which encompass 294 miles and span 12 counties in the greater Chicagoland region:

• Tri-State Tollway/I-94, I-294, and I-80
• Reagan Memorial Tollway/I-88
• Jane Addams Memorial Tollway/I-90
• Veterans Memorial Tollway/I-355
• Illinois Route 390 Tollway
• 5 Oases
• 30 Mainline Toll Plazas
• 57 Ramp Plazas
• 47 Unattended Plazas

Troop 15 headquarters is in Downers Grove. 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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