The 4th arrondissement is an arrondissement in the Ouémé department of Benin. It is an administrative division under the jurisdiction of the commune of Porto-Novo. According to the population census conducted by the Institut National de la Statistique Benin on February 15, 2002, the arrondissement had a total population of 57,311. References Populated places in the Ouémé Department Arrondissements of Benin