Aremark was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The new municipality of Øymark was separated from Aremark on 1 July 1903.

The Norse form of the name was Aramǫrk. The first element is the genitive of the name of the lake Ari (now Aremarksjøen). (The name of the lake is probably derived from ari which means "eagle", thus "eagle lake".) The last element is mǫrk f 'woodland, borderland' (see March).

The coat-of-arms is from modern times. They were granted on 7 November 1986. The arms show two blue-colored elk on a silver background. The elk was chosen as a symbol because of the large forests and the many animals in the area.

(See also the coat-of-arms for Namsos, Namsskogan, Ringsaker and Tynset.)

Farming and forestry are the two top components of Aremark's economy.

Every two years in Aremark there is a relatively large festival: Elgfestivalen (elk festival). It is held in a festivity area at Kirkeng Camping. It has been arranged every two years since September 1998. The festival begins Friday afternoon and lasts until Sunday afternoon.

There are two chapels/churches in Aremark. Aremark church, which is located near Kirkeng(Church meadow), and Holmgil chapel in Bjørkebekk (Birch creek).

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