Demographic movement in Finland did not end with the appearance of immigrants from Sweden in the Middle Ages. Finns who left to work in Swedish mines in the sixteenth century began a national tradition, which continued up through the 1970s, of settling in their neighboring country. During the period of tÍÍÍÍsarist rule, some 100,000 Finns went to Russia, mainly to the St. Petersburg area. Emigration on a large scale began in the second half of the nineteenth century when Finns, along with millions of other Europeans, set out for the United States and Canada. By 1980 Finland had lost an estimated 400,000 of its citizens to these two countries.

A great number of Finns emigrated to Sweden after World War II, drawn by that country's prosperity and proximity. Emigration began slowly, but, during the 1960s and the second half of the 1970s, tens of thousands left each year for their western neighbor. The peak emigration year was 1970, when 41,000 Finns settled in Sweden, which caused Finland's population actually to fall that year. Because many of the migrants later returned to Finland, definite figures cannot be calculated, but all told, an estimated 250,000 to 300,000 Finns became permanent residents of Sweden in the postwar period. The overall youthfulness of these emigrants meant that the quality of the work force available to Finnish employers was diminished and that the national birth rate slowed. At one point, every eighth Finnish child was born in Sweden. Finland's Swedish-speaking minority was hard hit by this westward migration its numbers dropped from 350,000 to about 300,000 between 1950 and 1980. By the 1980s, a strong Finnish economy had brought an end to large-scale migration to Sweden. In fact, the overall population flow was reversed because each year several thousand more Finns returned from Sweden than left for it.

Data as of December 1988