In 1434, Polish King Władysław II Jagiełło and Lithuanian Duke Sigismund Kęstutaitis met in Krynki, and renewed and strengthened the Polish–Lithuanian union.

[2] During the joint German-Soviet invasion of Poland, which started World War II in September 1939, the Polish 13th Observation Escadrille operated from Krynki.

In 1944, the German occupation ended and the town was restored to Poland, although with a Soviet-installed communist regime, which stayed in power until the Fall of Communism in the 1980s.

[4] Jews began living in Krynki in the 17th century when the Polish king Władysław IV Vasa invited them to town to boost trade and manufacturing.

In that year, Jakow Pat led Jewish workers and created the independent Republic of Krynki in defiance of the Russian imperial rule.

During the ghetto liquidation action, a number of Jewish insurgents responded by shooting at the Nazi police including their gun-wielding Belarusian auxiliaries, and many escaped into the forest.