The different colours represent the number of services/programs mapped (concentration of services): Legend: Red upside down tear-drop - represents a single location, if you click on it, the listing will appear and once zoomed in enough all listings will show up like this. Blue - represents locations with 2-9 listings Yellow - represents locations with 10-99 listings Red - represents listings in the hundreds 100-999 Pink - represents listings in the thousands 1000-9999 and Purple is 10,000 and above