Finland's National Archive contains around fourty shelf kilometer of documents. The oldest document are from the middle-ages. The oldest document from 1316 is King Birger's protection letter to the women of Karelia. Oldest whole document series are tax records which date back to the end of 1530's.
Documents from the Swedish reign are accounting records, court records and land maps. Most important sources from the autonomy era are senate archives, state secretary archives and general governor chamber's large archives.
National archive receives all the documents to be saved permanently for 40 years state from government and local institutions. Approximately 15-20% of the official documents are permanently stored.
National archive also receives private archives as donations or savings. Private archives contain archives of statesmen, politicians, culture persons as well as archives of various communities.
Most used archives be genealogist are general achive of population ("asutuksen yleisluettelo") and copies of parish records. In addition National Archive contains microfilm copies of documents stored in provincial archives, church archives and foreign archives.
Archives of Finnish evangelist-lutheran parishes which are older than 100 years are saved in National Archives as microfilms and they can be used by genealogists.
In addition National archive contains a large amount of maps and drawings, oldest dating back to seventeenth century.