When the new national border to the Russian Grand Duchy of Finland had been drawn Norrbotten County, the northernmost of the counties of Sweden, was created in 1810 consisting of the northern parts of Lappland and Västerbotten.
When the new national border to the Russian Grand Duchy of Finland formed, the province split in two, and formed the municipalities of Kolari, Muonio, Pello, Tornio, and Ylitornio. The northernmost of the counties of Sweden were created in 1810 consisting of the northern parts of Lappland and Västerbotten.