How to get gameobject of script with raycast?

i can't seem to get my head around this... I'm very new to raycast, so i apologize for any obvious mistakes.

so i have a script attached to a gameobject that shoots a raycast from screen with an if statement seeing if it hits the gameobject holding the script. there are more then one gameobject of this type. everytime i clicked on the gameobject it would work as normal but it would activate the code on all of the gameobjects. is there a way to get the gameobject itself?

here is a part of the code:

         if (Physics.Raycast (ray, out hit)) {
             if (isSelected != true) {
                 if (hit.collider.transform.gameObject.tag == "City") {
                     isSelected = true;
                 }
             } else {
                 if (hit.collider.transform.gameObject.tag == "City") {
                     isSelected = false;
                 }
             }
         }
     }
 
     Transform CityCanvas = transform.Find ("CityCanvas");
 
     if (isSelected != true) {
         CityCanvas.GetComponent<Canvas>().enabled = false;
     } else {
         CityCanvas.GetComponent<Canvas>().enabled = true;
 }

thanks in advance