Illinois Youth Center - Pere Marquette
Illinois Youth Center - Pere Marquette
Location: Grafton, IL
Security Level: Minimum-Security
History: Opened in 1963, Harrisburg is a medium-security male youth center located in Grafton, Illinois, about 40 miles northwest of St. Louis on the Mississippi River. It partners with Youth Build to offer programming to youth with high school diplomas or equivalent. It is IDJJ’s smallest and only minimum-security youth center.
Mailing/Contact Information:
Youth mailing address: 17808 State Highway 100W, Grafton, IL 62037
Telephone: (618) 786-2371
Population and program information sourced from IDJJ’s September 2025 Monthly Report and January 2026 Quarterly Report.
Facility Population: 18
Single-Bunking Capacity: 24
Percent of Capacity: 75%
Programming:
Number of students enrolled in high school: 14 (77.8%)
Number of students enrolled in vocational programs: 10 (55.6%)
Number of substance use disorder treatment participants: 0 (0%)
State Representatives: Current as of January 2026
C.D. Davidsmeyer (R) – House District 100
Springfield Office: 202-N Stratton Office Building, Springfield, IL 62706 (217) 782-1840
District Office: 325 W. State St., P.O. Box 160, Jacksonville, IL 62650, (217) 243-6221
Additional District Office: 100 S. State St., Jerseyville, IL 62052, (618) 639-2071
Jil Tracy (R) – Senate District 50
Springfield Office: 208B Capitol Building, Springfield, IL 62706, (217) 782-2479
District Office: 3601 E. Lake Centre Dr., Ste. 200, Quincy, IL 62305, (217) 223-0833
Additional District Office: 325 W. State St., Ste. 102, Jacksonville, IL 62650, (217) 408-1258
