Immigration lowered the population so that in the 1921 Polish census it was recorded as 1235. During the 1920s and 30s the community supported four restaurants, two groceries, and seven bakeries. They owned three mills, a leather factory, and a service station. There were also branches of the Betar organization and the Hadema sports club, and many charities. The 1939 population of 1450 had increased to 2000 by 1941. Most of this growth came from refugees who reached Knyszyn- then under Soviet occupation- from German-occupied regions.