Kellokoski (in Finnish ˈkelːoˌkoski/; Swedish: Mariefors) is one of the three villages in the Finnish municipality of Tuusula. It is located north of the town of Järvenpää. Kellokoski has a population of 4,400.[1]
Kellokoski has its own church, which was built in 1734,[2] and a psychiatric hospital.[3]
Most people speak Finnish. Earlier there were also people who spoke Swedish.
Kellokosken ruukki, pig iron factory started 1795. Nowadays, iron products have been replaced with products made from aluminium.