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- 19/12/1807 – The Prussian King Frederick II introduced a temporary division into poviats. The Department of Łomża includes, among others Wigry County.
- May 6, 1808 – creation of the Sejny poviat (instead of the Wigry poviat). In 1800. the Prussian government abolished the Camaldolese estate of Wigry, the same fate befell the Sejny Dominicans. Which in 1804. expelled from the monastery and the property confiscated. However, Sejny continued to develop as a royal city. Trade flourished, in 1808 a high school was established in Sejny, the rector of which was Wojciech Szwejkowski, who later became the first rector of the University of Warsaw. In 1805. the Prussian authorities, seeing no development prospects for Berżniki and Krasnopol, deprived them of their municipal status. Throughout the entire period of the Duchy of Warsaw, the administrative division was treated as temporary. It was not changed after the actual fall of the Duchy – the defeat of Napoleon at Leipzig in 1843. This state lasted until 1815. to Napoleon’s defeat at Waterloo. The Kingdom of Poland (Congress Poland) was established at the Congress of Vienna, but under the rule of Tsar Alexander I. The existing administrative division was maintained.
- 27/11/1815 – by virtue of the Constitution of the Kingdom of Poland signed by the Tsar, provinces were created instead of French departments, referring to the tradition of the Republic of Poland.
- 1/16/1816 – The Governor of the Kingdom created a new administrative division within the provinces, namely the district, which included from one to three counties. The kingdom was divided into eight provinces. One of them was the Augustów Province with the capital in Suwałki. In the Augustów voivodship, the following oblasts were established: Mariampolski, Calvary and Sejny. They coincided with the existing poviats of the same name.
- 1818 – the diocese of Augustów or Sejny was established. The bishops resided in Sejny. The diocese existed legally from 1818 to 1925, later it was transferred to Łomża.
- 1837 – after the fall of the November Uprising and the Polish-Russian war, Tsar Nicholas I began to liquidate the autonomy of the Kingdom. The goal was to incorporate the Kingdom into Russia. The names of offices and administrative districts have changed. The voivodeships were renamed the governorates and the counties were renamed districts.
- 1845 – The number of governorates was reduced from eight to five. The Augustów Governorate remained within its former borders. In the Sejny Oblast, the municipalities of Kudrana and Poniemoń were liquidated.
- 1866 – the Suwałki Governorate was created, which included the following poviats: Augustów, Calvary, Mariampolski, Sejny, Suwałki, Witkowy, Władysławowski.
- 1915 – In World War I, the Germans captured vast areas of Russia and divided them into military districts. The Suwałki Governorate was incorporated into the independent Suwałki District.
- May 1, 1916 – the military district of Suwałki was merged with the district of Vilnius.
- 1917 – both districts were liquidated and one large Lithuania was created with the seat of the authorities in Vilnius.
- 1918 – The Regency Council restored the division of communes on March 2, 1864.
- 08.1919 – The Council of Ministers temporarily upheld the former Russian division into counties.
- 1921 a general census was carried out in Poland. In the Sejny County there was one city of Sejny – 2,254 inhabitants and four communes: Berżniki, Giby, Krasnopol and Krasnowo.
- 1933 – By the ordinance of the voivode of October 14, rural communes were divided into groups. The cluster comprised one or two villages or more.
- September 28, 1939 – the German-Soviet agreement on the demarcation line. The Germans took over the Suwałki Region as “Lands incorporated into the Reich”. The so-called German offices were established. amtskomissariats. Sejny also became the seat of the Amtskomissariat.
- August 22, 1944 – PKWN restored the old voivodeships, poviats, communes and clusters. The territory of the Białystok voivodeship decreased because some of the lands were incorporated into the USSR. The Suwałki Region found itself in the Białystok Province.
- June 25, 1954 – the act on the reform of the administrative division of villages – the establishment of village national councils. The communities included villages located in one commune or neighboring communes.
- October 4, 1954 – The Provincial National Council in Białystok made an administrative division into new clusters, which consisted of the existing clusters. 11 clusters were created in Sejneńskie.
- 1 January 1956 – the Council of Ministers re-established the Sejny County. Its territory was separated from the Suwałki poviat. The new poviat included: the city of Sejny and the new clusters: Berżniki, Giby, Głęboki Bród, Jodeliszki, Klejwy, Krasnopol, Maćkowa Ruda, Ogrodniki, Pogorzelec, Puńsk, Skustele, Smolany, Świackie and Widugiery.
- November 29, 1972 – The Act of the Council of Ministers on the liquidation of the previous division of rural areas into clusters (the act entered into force on 1 January 1973). The villages of Jegliniec, Linówek and Orlinek departed from the Suwałki poviat to Sejny, and the Red Cross, Mikołajewo, Rosochaty Róg villages from Sejny to Suwałki poviat and the area of state forests with an area of 445 ha.
- June 1, 1975 – new centralizing two-tier administrative division: voivodeships and communes. Among the newly created 49 voivodships, the Suwałki voivodship was created, and in it the city-commune of Sejny.
- On July 1, 1976 in the former Sejny poviat, the Berżnik commune was abolished, incorporated into the Giby commune (areas of the villages: Budwieć, Kukle, Stanowisko and Zelwa). The following were included in the Sejny commune: Berżniki, Berżniki Folwark, Bierżałowce, Bose, Dubowo, Dworczysko, Hołny Mejera, Hołny Wolmera, Krejwińce Markiszki, Poćkuny, Podlaski, Ogrodniki, Półkoty, Rachelany, Sztabinki and Wiigrance.
- July 1, 1981 – the area of Babańce village was transferred from the Krasnopol commune to the Sejny commune.
- July 24, 1998 – the act on introducing a three-tier decentralization division of the territory of the state. The act came into force on 1 January 1999, according to the act the units of this division are communes, poviats and voivodships. Among the 16 new voivodships, the Podlaskie voivodeship with its seat in Białystok was established. The voivodeship comprises 118 communes and 14 poviats, including the Sejny poviat, which includes the city of Sejny and the communes of Giby, Krasnopol, Puńsk and Sejny.