if you are talking about Eldoret kenya, then there are three languages that will get you everywhere. English is widely spoken and you should not have any problem getting along. The literacy rate within the town and the region generally is fairly above the general KEnyan average. Kiswahili is an East and Central African Language and is spoken by everybody in Eldoret literally. There is however the language spoken by the people of the town whose majority are the Nandi's and the Keiyos. The speak Kalenjin. Hope this is useful.