Final answer:
A Geographic Information System (GIS) is used to organize contact information for a specific geographical area or group. It allows users to assimilate and manage map data, providing specific information about a place.
Step-by-step explanation:
The tool used to organize contact information for a specific geographical area or group is a Geographic Information System (GIS). GIS allows users to assimilate and manage map data in digital form, organizing it into layers and providing specific information about a place. By sorting and analyzing these layers, GIS software can illustrate specific features or activities in a given area.