“Globally, key and mobile populations are exposed to numerous health risks and vulnerabilities due to risk factors such as risky sexual behaviours, low risk perception, high levels of mobility, unsanitary accommodation, and inadequate access to health and social services. In the East Africa Community (EAC) region, these challenges are further compounded by the limited access to comprehensive health care along the transport corridors. This Policy Brief highlights results of a mapping exercise conducted to gather comprehensive up-to-date information on available health services along transport corridors in the EAC, for effective integrated programming for health and HIV/AIDS along the corridors.”