○            佐野日大高校 （1）───────────────────────────┐                                                              
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                足利清風高校 （2）─────────────┐                          │            │                                                
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                作新学院高校 （3）──────┐            │            │            │            │                                                
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                那須拓陽高校 （4）──────┘                          │            │            │                                                
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                  上三川高校 （5）──────┐                          │                          │                                                
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                    石橋高校 （6）──────┘            │            │                          │                                                
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                  大田原高校 （7）─────────────┘                                        │                                                
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              宇都宮白楊高校 （8）────────────────────┐                          │            │                                  
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                宇都宮東高校 （9）─────────────┐            │            │            │            │                                  
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                小山城南高校（10）──────┐            │                          │            │            │                                  
                                              ├──────┘                          │            │            │                                  
                  足利南高校（11）──────┘                                        │            │            │                                  
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                  鹿沼東高校（12）──────┐                                        │                          │                                  
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              宇都宮清陵高校（13）──────┘            │                          │                          │                                  
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                    栃木高校（14）─────────────┘            │            │                          │                                  
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  ○          宇都宮工業高校（15）────────────────────┘                                        │                                  
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  ○            宇都宮南高校（16）────────────────────┐                                        │            │                    
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                真岡工業高校（17）─────────────┐            │            │                          │            │                    
                                                            │            │            │                          │            │                    
                                                            ├──────┘            │                          │            │                    
                    茂木高校（18）──────┐            │                          │                          │            │                    
                                              ├──────┘                          │                          │            │                    
                    矢板高校（19）──────┘                                        │                          │            │                    
                                                                                        ├──────┐            │            │                    
          栃木翔南・佐野松桜（20）──────┐                                        │            │            │            │                    
                                              ├──────┐                          │            │            │            │                    
    鹿沼南・栃木農・佐日中等（21）──────┘            │                          │            │            │            │                    
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                    足利高校（22）─────────────┘            │            │            │            │            │                    
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                青藍泰斗高校（23）────────────────────┘                          │            │            │                    
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              國學院栃木高校（24）────────────────────┐                          │                          │                    
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                  佐野東高校（25）─────────────┐            │            │            │                          │                    
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                今市工業高校（26）──────┐            │                          │            │                          │                    
                                              ├──────┘                          │            │                          │                    
                  黒磯南高校（27）──────┘                                        │            │                          │                    
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  ○            矢板中央高校（28）───────────────────────────┘                                        │                    
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  ○          足利大附属高校（29）───────────────────────────┐                                        │                    
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                  馬頭・那須（30）──────┐                                        │            │                          │                    
                                              ├──────┐                          │            │                          │                    
                    烏山高校（31）──────┘            │                          │            │                          │                    
                                                            ├──────┐            │            │                          │                    
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                  宇都宮高校（32）─────────────┘            │            │            │                          │                    
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              さくら清修高校（33）────────────────────┘                          │                          │                    
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                  小山南高校（34）────────────────────┐                          │            │            │                    
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                    小山高校（35）─────────────┐            │            │            │            │            │                    
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                    黒磯高校（36）─────────────┘                          │            │            │            │                    
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                    鹿沼高校（37）──────┐                                        │                          │            │                    
                                              ├──────┐                          │                          │            │                    
              宇都宮商業高校（38）──────┘            │                          │                          │            │                    
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                那須清峰高校（39）─────────────┘            │            │                          │            │                    
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  ○          白鴎大足利高校（40）────────────────────┘                                        │            │                    
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  ○      宇都宮短大附属高校（41）────────────────────┐                                        │                                  
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                  矢板東高校（42）─────────────┐            │            │                          │                                  
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                                                            ├──────┘            │                          │                                  
              宇都宮中央高校（43）──────┐            │                          │                          │                                  
                                              ├──────┘                          │                          │                                  
          高根沢・幸福の科学（44）──────┘                                        │                          │                                  
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          壬生・佐野・足利工（45）──────┐                                        │            │            │                                  
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                栃木工業高校（46）──────┘            │                          │            │            │                                  
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                宇都宮北高校（47）─────────────┘            │            │            │            │                                  
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            文星芸大附属高校（48）────────────────────┘                          │            │                                  
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                益子芳星高校（49）─────────────┐                                        │                                                
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                                                            ├──────┐                          │                                                
                真岡北陵高校（50）──────┐            │            │                          │                                                
                                              ├──────┘            │                          │                                                
                小山北桜高校（51）──────┘                          │                          │                                                
                                                                          ├──────┐            │                                                
                    今市高校（52）──────┐                          │            │            │                                                
                                              ├──────┐            │            │            │                                                
                  星の杜高校（53）──────┘            │            │            │            │                                                
                                                            ├──────┘            │            │                                                
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                  小山西高校（54）─────────────┘                          │            │                                                
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  ○                真岡高校（55）───────────────────────────┘