As a result of Russian discriminatory policies for much of the 19th century – a time when the town's population steadily increased – Jews were the majority of Siedlce's population: 3,727 (71.5%) in 1839; 4,359 (65%) in 1841; 5,153 (67.5%) in 1858; 8,156 (64%) in 1878. Later on, the percentage of Jews decreased due to non-Jewish migration: according to the Russian census of 1897, out of the total population of 23,700, Jews constituted 11,400 (so around 48% percent). The first Polish census, in 1921, recorded 14,685 Jews living in Siedlce. Their number remained steady in the interwar period, and in 1939, on the eve of the Second World War, there were some 15,000 Jews living in the town.