Till 2000
Diplomatic
Embassy of the USSR
Till 2000 no Embassy codes were used, but only a country's abbreviation.

From 1970
Passenger
WU denotes "Western Urban" district, which is where the capital of "Freetown" is located.

Pre 1999
Taxi
WU = Western Urban (Freetown)
( Possible repaint )

1999 on
Government

1970s
Stencilled

Current
NGO = Non-Government Organisation

Current
Passenger

Current
Commercial

From 1999
Passenger

Government

1980s
Eastern Province