Oudesluis, Schagen  Oudesluis is a village in the Dutch province of North Holland. It is a part of the municipality of Schagen, and lies about 21 km south of Den Helder. In 2001, the village of Oudesluis had 538 inhabitants. The built-up area of the village was 0.11 km², and contained 192 residences. The wider statistical area of Oudesluis has a population of around 760. This includes the hamlet of Keinsmerbrug.