Known only from central and southern Kenya, south-eastern Uganda, and from the Udzungwa Mountains (900 km to the south) in Tanzania (Van Rompaey and Kingdon in press). The Tanzanian population seems to be highly localized: camera-trapping conducted over three years in 76 sites throughout the Udzungwa Mountains recorded Jackson’s mongoose in only five sites, all within Matundu Forest (De Luca and Rovero 2006). It is possible that this species occurs in and around other massifs within the Eastern Arc Mountains, including the Ulugurus, Ngurus and Usambaras. Recorded to montane elevations in the Aberdares, Mt. Kenya and Mt Elgon up to 3,300 m asl.