Finnmark had (and has) a sizeable population of Finnish-speaking people. In 1910 this number was further increased by children of nomad Saami people who lived and worked on the plains transgressing the border. Finland was counted as a country at the time, though legally it was a duchy of the Russian Empire. Others specified certain parts of the Russian Empire, mainly non-Russian-speaking minorities like Latvians, Estonians and Polish Jews. A few foreigners were sailors on ships docking in Norway at the day of the census.
County names are given in their modern form.