User View List in Drupal filter by taxonomy
You can accomplish this using the views module. Its the Drupal GUI way to build queries so you will be able to crate a page that lists all users based on the field you need.

Here goes a really good reference that may help you with that:

http://nodeone.se/en/taming-the-beast-learn-views-with-nodeone

If you prefer to get your hands dirty you can use the Entity Field Query