In the Isle of Kalsoy, there are two postal districts: the District of Husar, with the villages of Husar (48 inhabitants) and Syðraladur (14 inhabitants), and the District of Mikladadur, with the villages of  Mikladadur (53 inhabitants) and Trøllanes (24 inhabitants). Both districts have primary schools. The one in the District of Husar, with its 14 students, opens alternatively in Husar and Syðraladur, switching over on a weekly basis. The primary school of the District of Mikladadur, with its 12 students, opens instead only in Mikladadur. After the age of seven, children of both districts move to the school of Klaksvik.

The Isle of Kalsoy also has two churches, one for each district.

The economy of the island is mostly based on agriculture and sheep breeding. However, many are employed in the field of fishing and commute daily to the near wharf of  Klaksvik. For their sake, it would be desirable the completion of the tunnel project between the islands of Kalsoy and Streymoy, together with the over 5km of tunnel already existing in the same island.

A regular postal service with the Kalsoy Island was not possible before 1905, when Samson and Marius Joensen began to transport mail between Klaksvik and Kalsoy, via sea (of course) and twice a week (Samson on Tuesdays, Marius on Fridays).

In 1927, the service was improved thanks to the introduction of a motorboat, the “Guttaberg” cutter, and with the opening of the Post Office of Husar and Mikladadur on April 1.

In Husar, the office was assigned to Danial Hansen, who maintained the position for 22 years, when he was substituted by Anthon Højgaar, who maintained the position until the closing of the office in 1991.

In Mikladadur, the post office was instead assigned to Joan Magnus Eliasen, who managed the office for 33 years, until he was substituted by his son, Liggjas Eliasen. The Mikladadur Post Office was also closed in 1991.

Moving back to 1927, together with the opening of the Post Offices of Husar and Mikladadur, an unofficial service was also set up in Syðraladur, at the “Har Uti” house, with Danal Peter Sominsen, and in Trøllanes, at the Innistovu farm with Jogvan Joensen.

All four offices in Kolskoy were closed in 1991 with the new postal policy, supporting the collecting and delivery service at the Klaksvik Office with a mail-woman, Signhild Joensen, who still to this day visits all the 36 houses of the island, collecting and delivering letters, parcels and money, as there are no banks in the island.