1) Stockholm urban area 
Kallhäll is a neighbourhood in Järfälla Municipality, Stockholm County. It is a suburban part of Stockholm urban area with a population of 12.000 inhabitants as of 2011 (including Stäket). Kallhäll started as an industrial suburb when the industrialist Erik Bolinder decided to move his Bolinders Mechanical Shops to Kallhäll from Kungsholmen ...