Where to apply for an airport transit visa?

My place of residence My visa application should be submitted to

Senegal,

Cabo Verde,

Gambia,

Guinea Bissau 

Embassy of Switzerland in Dakar 
Mali see Representation agreement below  
Mauritania  see Representation agreement below 

Representation agreement

If a State does not have its proper visa section in a country or region, the delivery of a Schengen visa can be delegated to another Schengen State member with an agreement between both countries concerned.

The agreement allows the appointed representation to represent and handle Schengen visa applications within its own competence without consulting the other represented State.

Country / Region Schengen State which represents Switzerland My visa application should be submitted to
Mali  France  Consulate General of France in Bamako 
Mauritania   France   Embassy of France in Nouakchott 
Country / Region Schengen State represented by Switzerland

Senegal

Cabo Verde

Gambia

Mauritania 

Latvia