The main cargo hubs in West Africa are Lagos and Lome, Togo. AfricaWestCargo...
AFRICA WEST CARGO?
is the company out of Lome. Last I heard they replaced their two DC-9s with two 767s to distribute the cargo locally throughout West Africa.
In NBO, Astral Aviation handles a lot of the local cargo for Eastern Africa.
Not sure about cargo for Northern/Southern Africa.