With approximately 400 mountain gorillas living in the impenetrable forests, Uganda is home to more than half of the world’s total population of mountain gorillas.

Uganda currently hosts twelve gorilla families and one group that is only available for research. The majority is found in different areas of Bwindi Impenetrable National Park and Mgahinga National Park.

Presently you can track 11 gorilla families inhabiting Bwindi Impenetrable Forest translating into a maximum of 88 permits per day – meaning that 88 visitors a day can track Mountain Gorillas in Bwindi Impenetrable Forest and one gorilla family ( Nyakagezia a transitory gorilla family often on the move) in Mgahinga Gorilla National Park with 8 permits, for a total of 96 daily permits being available.

The following are the Group families in Uganda

Bitukura Gorilla Group
Busingye Gorilla Group
Bweza Gorilla Group
Habinyanja Gorilla Group
Kahungye Gorilla Group
Mishaya Gorilla Group
MUBARE (Mubale) Gorilla Group
Nkuringo Gorilla Group
Nshongi Gorilla Group
Nyakagezi Gorilla Group
The Oruzogo Gorilla Group
The Rushegura Gorilla Group
Source
Africa Travel Rresource : http://www.africatravelresource.com/africa/uganda/bwindi/guide/1593/