Its population (2005) is 3,140. Årnes is located in the nort-east of Akershus a long Glomma (Norway's largest river), and is the largest municipality in Nes Kommune. Areas that compose Årnes are among others Årnes sentrum, Runni, Drognes, Høie, Fjuk, Dragsjø, Kjus, Fjellfoten, Bodding, Henni, Husmo, Østgård, Bjørknes and Sagstua.
Årnes and the fields surrounding it was known as Årnes Gård (Årnes farm) until 1862 when the railway between Christiania and Kongsvinger was built. Årnes got a train-station and this made it easier to transport lumber and other materials from the village to the capital.
ARNES stands for Academic and Research Network of Slovenia. Its main task is development, operation and management of the communication and information network for education and research, and was established as an independent public institution in 1992.