The municipality (originally the parish) is named after the old (and no longer existent) Leirheimr farm.

Granted on 26 July 1957, they show a red waterwheel on a gold background.

[5] [6] The municipality is located just east of the capital, Oslo, with many main roads going through it.

The southern parts consist of forest, while farms and grain fields occupy the space in between.

From 2006 to 2008, workers renovated the village of Lørenskog (the administrative center of the municipality), also called the "Metro Senter".

This renovation includes a considerably larger shopping mall, a bus terminal with buses going in and out of Oslo every 15 minutes, possibly a future subway station, and the new Mailand Upper Secondary School.

The headquarters of Power, a consumer electronics company, are located at Lørenskog.