The biggest township in the municipality is Borgarnes, with a population of 1,887 inhabitants.

[3] Other densely populated areas in the municipality include Bifröst, Hvanneyri, Kleppjárnsreykir [ˈkʰlɛhpˌjaur̥sˌreiːcɪr̥], Reykholt and Varmaland.

There is a secondary school in Borgarnes, Menntaskóli Borgarfjarðar.

The municipality runs two primary schools; one is in Borgarnes and the other has three separate facilities in Hvanneyri, Kleppjárnsreykir and Varmaland.

The municipality also runs a music school in Borgarnes.