Pernis is a neighborhood and submunicipality (since 3 March 2010) of Rotterdam, Netherlands. The district has a population of 4,789 (2011) on a total area size of 1.60 km². Pernis is thus a full submunicipality of Rotterdam, but the former independent municipality had its own district council already. Although surrounded by ports, Pernis has preserved its village-like atmosphere very well.Pernis is best known for its petrochemical industry. Refineries define its skyline.