__NOTOC__ Sejny County () a county in Podlaskie Voivodeship, in the extreme north-east of Poland, on the border with Lithuania and Belarus. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and only town is Sejny, which lies north of the regional capital Białystok.
The county covers an area of . As of 2019 its total population was 20,002, with Lithuanians comprising 20.2% (4,271) of the inhabitants.
Neighbouring counties Sejny County is bordered by Augustów County to the south and Suwałki County to the west. It also borders Lithuania to the north-east and Belarus to the east.
Administrative division The county is subdivided into five gminas (one urban and four rural). These are listed in the following table, in descending order of population.
Gmina Type Area(km2) Population(2019) SeatSejnyurban4.55,286 Gmina Puńskrural138.44,164PuńskGmina Sejnyrural218.04,028Sejny *Gmina Krasnopolrural171.63,810KrasnopolGmina Gibyrural323.62,714Giby* seat not part of the gmina
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