Kellokoski (Finnish pronunciation: ['k?l:?k?ski]; Swedish: Mariefors) is one of the three villages in the Finnish municipality of Tuusula. It has a population of 4,400.
Kellokoski has its own church, which was built in 1734, and a psychiatric hospital.
Most people speak Finnish. Earlier there was also people who spoke Swedish.
Kellokosken ruukki, pig iron factory started 1795. Nowadays, iron products have been replaced with products made from aluminium.
Coordinates: 60°33?N 25°06?E / 60.550°N 25.100°E / 60.550; 25.100