A nightblood survey has been carried out in 82 localities situated in various parts of Liberia. A total of 8072 people have been examined for the presence of microfilariae of Wuchereria bancrofti and 403 (5.0%) have been found positive. However, the distribution of the disease was quite uneven. The infection was common in the coastal zone showing an average microfilaria prevalence of 9%, while in the forest belt among 5383 people living in rural areas only 109 (2.0%) were found to harbour microfilariae. In the savannah area out of 2198 people examined 209 (11.4%) persons were carriers of microvilariae.