Most of Lierne Municipality lies on the Swedish side of the drainage divide between Norway and Sweden.

During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee.

The official blazon is "Azure, three grouses argent, two over one" (Norwegian: I blått tre stående sølv ryper, to over en).

The ptarmigan design has a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used.

Historically, hunting ptarmigan was of great importance for the survival of the inhabitants during the winters.

[1] Lierne is also home to many lakes, including Gusvatnet, Havdalsvatnet, Holden, Ingelsvatnet, Kingen, Kvesjøen, Laksjøen, Lenglingen, Limingen, Murusjøen, Rengen, Sandsjøen, Stortissvatnet, Tunnsjøen, and Ulen.

Lierne Municipality was the largest obstacle in the negotiations before the Stromstad Treaty of 1751 in which the border was defined in detail.

As compensation Norway gave up its demand for the Idre and Särna parishes which were under Swedish control since 1644.

The municipal council (Kommunestyre) of Lierne is made up of 15 representatives that are elected to four year terms.

The tables below show the current and historical composition of the council by political party.