The arms show three silver horse heads with waving manes on a red background.
The arms are canting, a reference[citation needed] to an interpretation of the first part of the name Skedsmo, skeið.
In this area, the tribe of Raumas fought against King Olav Haraldsson, patron saint of Norway, in 1028.
Strømmens Værksted built the country's first trains, at Kjeller airplanes were constructed up to World War II, the sawmills at Lillestrøm processed lumber from the great forests, and a number of other enterprises have been important.
The head office of Accident Investigation Board Norway is located in Lillestrøm, Skedsmo.