Try these official sites (in English) for social, economic, and demographic statistics. You'll find primarily modern data, but content might be useful depending on how you are writing about a pre-1800 topic.
"The Northern Lights in the Arctic Circle,"
CICE International Photography Contest,
Photo by Zachary Gardner, 2015
-- Historical Dictionary of Denmark (Ref DL105 .T46 1998)
-- Historical Dictionary of Finland (Ref DL1007 .M38 1995)
-- Historical Dictionary of Iceland (Ref DL338 .G82 1997)
-- Historical Dictionary of Norway (Ref DL443 .S63 2008)
-- Historical Dictionary of Sweden (Ref DL643 .S37 1995)
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