intercounty
adjective
                                                                                                                            
                                                            in·ter·coun·ty
                    
                                                                                                              
                                                                                                                                  ˌin-tər-ˈkau̇n-tē 
                                                      
                                                          
            
            variants  
 or inter-county
        
    
                                
              
          
                                                      : occurring between or involving two or more counties                                      
              
                             
an intercounty school district
                                       an intercounty competition
                         
                
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  Merriam-Webster unabridged




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