Those who came in the 19th Century often came via other European countries. A German company also transported Finnish travelers by ship and train to Bremerhaven where they boarded ocean-going liners. After 1891 the Finland Steamship Company began carrying passengers from Hango, Finland to England. In 1900 almost half of the Finns in the U.S. resided in Michigan and Minnesota. Others lived in Massachusetts, New York, Washington, Oregon, California, Montana, Wisconsin, Illinois, Ohio, Pennsylvania and New Jersey.
Finnish research is similar to other Scandinavian lines.
The Lutheran Main Books, also called Population Registers, are invaluable. They start about 1667. You will find dates of all vital events, changes of addresses, origins and later destinations, standards of religious knowledge, and relationship with other families. The records are in local church custody with microfilm copies in the various archives in Finland. Since Finland was part of Sweden from the 12th Century until 1809, the early genealogical records for Finland are recorded in both Finnish and Swedish.