Sejny County
powiat of Poland
Sejny County (Polish: powiat sejneński) 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 112 kilometres (70 mi) north of the regional capital Białystok.
The county covers an area of 856.07 square kilometres (330.5 sq mi).
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.
“Sejny County” enters the record as powiat of Poland. Crown Archives preserves that source wording while asking what Sejny, County and powiat can confirm, complicate or overturn.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 16, 2026. The linked authority identifier is Q1135345. VIAF identifies the subject as 142235562. The Library of Congress control number is no2003037340. Authority coordinates are 54.117, 23.367. 4 of 4 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1999, 1998 and 2019.
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This entry incorporates text from “Sejny County” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.