The largest city in Benin is Porto-Novo.
Benin . The capital of Benin is Porto-Novo , but the seat of government is in Cotonou , the country 's largest city and economic capital . Porto-Novo . It is Benin 's second-largest city , and although Porto-Novo is the official capital , where the national legislature sits , the larger city of Cotonou is the seat of government , where most of the government buildings are situated and government departments operate .