According to the 2002 census, there were 386 Czechs living in Poland.
Most of them reside in and around Zelów (81, in Łódź Voivodeship), in the Czech Corner within the southwest portion of Kłodzko County (47, in Lower Silesian Voivodeship) and in the Polish sections of Cieszyn Silesia (61). Some live in Warszawa.
According to the 2011 census 3447 people declared Czech nationality.
Prior to the outbreak of the Second World War, there was a larger population of Czechs living in Poland, especially in the region surrounding Zelów (forming a majority in the county) as well as in Wołyń Voivodeship (1.5%). After the war the Czechs of Wołyń were expelled by the Soviet Union, and forcibly resettled in Czechoslovakia.
References
Czechs in Poland Wikipedia(Text) CC BY-SA