Liezen covers an area of 56.36 km2 and has a population of 6,856, as of the 2011 census. The town is located at 664 meters above sea level.
Its mayor, Rudolf Hakel, is a member of the regionally prominent political party SPÖ, which also holds an absolute majority in the local council with 17 members out of 25.
A large mechanical engineering plant Maschinenfabrik Liezen und Gießerei is located in the east of the town; it was connected to the 'Noricum scandal' in the 1980s due to the illegal export of armaments. As of 2012 the company remains a large employer.