It is also the only significant settlement within the Vaxholm Municipality that is on the Swedish mainland, rather than on islands of the Stockholm archipelago.

The land formerly belonged to the Brahe family, who owned the entire Bogesundslandet peninsular and Bogesund Castle.

[citation needed] The castle lies some 2 kilometres (1.2 mi) west of Karlsudd.

Storstockholms Lokaltrafik operates bus route 681 that passes the entrance to Karlsudd on its way to and from Vaxholm town.

Karlsudd pier is also served throughout the ice-free period of the year by passenger ships of the Waxholmsbolaget, providing a connection to Vaxholm town and Stockholm city.