These cover Caithness (including Wick, Thurso, Halkirk, Berriedale, Dunbeath, Latheron and Lybster), east Sutherland (including Golspie, Brora, Helmsdale, Kinbrace and Forsinard) and the Orkney Islands.

The postcode area is often mistaken as Kirkwall.

However, the convention is that the area is named after the post town where the '1' is located.

In this case, KW1 covers the town of Wick, along with John o Groats and Keiss, and this is the correct area.

The approximate coverage of the postcode districts: