| Location | Call Number | Note | Status | Due Date |
|---|
| Argenta-Oreana Elementary School - Fiction | F HOR gate #2 | | In | |
| Argenta-Oreana Jr-Sr High School - Fiction | FIC HOR Gatekeepers #2 | | In | |
| Arthur Public Library District - Young Adult Fiction - Young Adult Shelves | YF HOR | | In | |
| Barclay Public Library District - Juvenile Fiction | J HOR | | In | |
| Bethalto Public Library District - Young Adult Fiction | Y HOR | | In | |
| Bismarck-Henning Jr High School - Accelerated Reader Fiction | F HOR | | In | |
| Bunker Hill Public Library District - Young Adult - Young Adult Library | YA HOR GATEKEEPERS 2 | | In | |
| Bunker Hill Wolf Ridge Education Center - Fiction | F Hor | | In | |
| Carbondale Middle School - Fiction | Hor | | In | |
| Carbondale Middle School - Fiction | Hor | | In | |
| Carmi-White Co High School - Fiction | HOR | | In | |
| Carrier Mills-Stonefort PLD - JLN, Juvenile Fiction | J HOR | | In | |
| Carrollton Public Library - Young Adult Fiction | YA HOR | | Out | July 14, 2024 |
| Casey-Westfield Jr-Sr High School - Accelerated Reader | Fic Hor | | Missing | |
| Casey-Westfield Jr-Sr High School - Accelerated Reader | Fic Hor | | In | |
| Casey-Westfield Jr-Sr High School - Fiction | Fic Hor | | In | |
| Central AM Gregory Intermediate School - Fiction | F HOR | | In | |
| Central AM Middle School - Fiction - Fiction | F HOR | | In | |
| Central AM Middle School - Fiction - Fiction | F HOR | | In | |
| Charleston Carnegie Public Library - Young Adult Fiction - Teen Room | ZONE HOROWITZ | | In | |
| Chatham Area Public Library District - Young Adult Fiction | Y HOR | | In | |
| Cissna Park Community Library District - Juvenile Fiction | JF HOR | | In | |
| Danville Public Library - Juvenile - New Arrivals | J Hor | | In | |
| Decatur Montessori Academy for Peace - Fiction | F HOR | | In | |
| Decatur Public Library - Young Adult Fiction - Young Adult Shelves | Y Horowitz, A. | | In | |
| Decatur Stephen Decatur Middle School - Fiction | HORROR F HOR VOL 2 | Lex 680 | In | |
| Decatur Stephen Decatur Middle School - Fiction | HORROR F HOR VOL 2 | | In | |
| Fisher Jr-Sr High School - Fiction | Fic Hor | | In | |
| Gillespie 7-Ben-Gil Elem School - Fiction | F HOR | | In | |
| Grand Prairie of the West Public Library District - Young Adult | YF HOR | | In | |
| Hamilton Co Jr-Sr High School - Fiction - Fiction | Fic H 785 GAT - 2 JH | | In | |
| Harrisburg East Side Intermediate School - Accelerated Reader 4 | HOR | | In | |
| Harrisburg High School - Accelerated Reader | AR HOR | | In | |
| Harrisburg Middle School - Accelerated Reader Fiction | HOR | | In | |
| Hayner Downtown Library - Juvenile | jF HOR | | In | |
| Iroquois Co Watseka Community High School - Fantasy - Fantasy | F HOR Book 2 | | In | |
| Jersey Community Middle School - General Collection | FIC HOR | | In | |
| Lincoln Public Library District - Young Adult Fiction - Young Adult Shelves | Y HOR | | In | |
| Maroa-Forsyth Middle School - Horror | HORROR HOR | | In | |
| Marshall Jr High School - Accelerated Reader | FIC HOR | | In | |
| Marshall North Elementary School - Accelerated Reader Fiction | F HOR | | In | |
| Mascoutah Public Library - Young Adult | Y FIC HOROWITZ | | In | |
| Mattoon Public Library - Young Adult Fiction - 2nd Floor | YT Fiction Horowitz, A. | | In | |
| Milford Area K12 Schools - Elementary Fiction | F Hor | | In | |
| Mississippi Valley Collinsville Library - Juvenile | J FIC HOR | | In | |
| Moweaqua Public Library District - Young Adult Fiction | YS HOR 02 | | In | |
| Mt Zion District Library - Young Adult Fiction | YA/ HOR/ GATE/ BK.2 | | In | |
| Mt Zion Grade School - Juvenile Fiction - Adventure | F Hor | | In | |
| Mt Zion Intermediate School - Fiction - Adventure | F HOR | | In | |
| Mt Zion Intermediate School - Fiction | X Hor | | In | |
| Mt Zion Intermediate School - Fiction | X Hor | | Missing | |
| Mt Zion Jr High School - Fiction - Fantasy | Fic Hor #2 | | In | |
| Nashville Public Library - Young Adult Fiction - Young Adult Shelves | YA F HOR | | In | |
| Neoga Elementary School - Fiction | AR 4.7 F HOR | | In | |
| Neoga Jr-Sr High School - Fiction | F HOR | | Missing | |
| Okaw Valley Middle School - Fiction | Fic Hor | | In | |
| Oreana Library - Young Adult Fiction | YA HOR #2 Gatekeepers | | In | |
| Paris Cooperative High School - Fiction | FIC HOR | | Lost | |
| Porta High School - Fiction | F HOR | | In | |
| Rantoul Public Library - Young Adult Fiction | Y HOROWITZ | | In | |
| Riverton Middle School - Fiction | FIC HOR | | Missing | |
| Roxana Jr High School - General Collection | FIC HOR | | In | |
| St Joseph Middle School - Fiction | F HOR | | In | |
| Stewardson-Strasburg K12 Schools - Fiction | F HOR | | In | |
| Teutopolis Jr High School - Juvenile Fiction | FIC HOR | | In | |
| Tolono Unity Jr High School - Fiction | FIC HOR | | In | |
| Trenton Public Library - Young Adult | YA Horowitz | | In | |
| Tri-City Public Library District - Young Adult Fiction | YF HOR | | In | |
| Tuscola East Prairie Middle School - Fiction | F Hor | | In | |
| Unity Point Elementary School - Fiction | EFG F HOR | | In | |
| Valmeyer Public Library District - Young Adult - Young Adult Shelves | [YA] Horowitz | | In | |
| Vandalia Community High School | HOR | | In | |
| Vandalia Jr High School - Fiction | HOR | | In | |
| Westville High School - Fiction - Fiction | Fic Hor | | In | |
| Williamsville Jr High School - Fiction | FIC HOR | | In | |
| Williamsville Public Library - Young Adult Fiction | Y FIC HOR | | In | |
| Windsor Jr-Sr High School - Fiction | F HOR | | In | |
