How Do I Make An Object Appear ONLY When I've Zoomed In Close Enough

You could do a script which counts distance between your camera and the object

 Vector3.distance(object.transform.position, camera.transform.position);

and then turns rendering on and off depending if the distance is larger than your chosen view distance.

http://forum.unity3d.com/threads/this-script-gives-you-objects-screen-size-in-pixels.48966/

 float DistanceAndDiameterToPixelSize(float distance, float diameter){
        
     float pixelSize = (diameter * Mathf.Rad2Deg * Screen.height) / (distance * Camera.main.fieldOfView);
     return pixelSize;
 }

then you can define that if greater than a threshold => render object.

You need to keep track of the region name objects, for example by keeping references to them in an array or List of type GameObject. You then need to continually check the distance from the camera's position to each region name object, via Vector3.Distance. If the distance is less than a set threshold, you access that region name object's Renderer component and enable it, otherwise you disable it.

Here is a sample script, it's meant to be attached to the camera gameobject.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class TrackDetailObjects : MonoBehaviour {
      public List<GameObject> detailObjects = new List<GameObject>();//fill this list via the inspector or via script with the region name objects
 
      public float detailThreshold = 50f;
 
      void Update() {
            CheckDistances();
      }
 
      private void CheckDistances() {

           foreach(GameObject go in detailObjects) {
                float distance = Vector3.Distance(transform.position, go.transform.position);
                if(distance < detailThreshold) {
                     Renderer renderer = go.GetComponent<Renderer>();
                     if(renderer != null && renderer.enabled == false) {
                          renderer.enabled = true;
                     }
                }
                else {
                     Renderer renderer = go.GetComponent<Renderer>();
                     if(renderer != null && renderer.enabled == true) {
                          renderer.enabled = false;
                     }
                }
           }
      }
 }

Note that this is not the most efficient code as it accesses the Renderer component of all objects each frame, but it's good enough to get you started and shouldn't affect performance.