Campsites in Finland on the map: over 600 sites with caravan pitches, cabins and tent areas, by municipality. Free, no registration.
620 places in
Most camping sites are in Inari (22), Utsjoki (21) and Kouvola (20). The full list is below by municipality, and the map can be filtered to your own area.
The remaining places are on the map and in the municipality list.