The arms show the two silver lines running in a bend sinister direction on a green background.

The lines also symbolize tree logs, as forestry is of great importance for the local economy.

[4][5] Nittedal lies directly northeast of Oslo and serves as a suburb to the capital.

Further north lie the centres of Slattum, Rotnes, Åneby, Grønvoll, Varingskollen, and Hakadal.

In 1902 the construction of the Gjøvik Line reached the west side of Nittedal, from Oslo and through the forest.