In the half of the 15th century a village named Zacięciwa (present Wołomin); from 1795 in the Austrian Partition; from 1809 in the Duchy of Warsaw, from 1815 in the Russian Partition (Kingdom of Poland); development at the turn of the 19th and 20th centuries (since 1862 the railway line and railway workshops, from 1905 the glassworks); 1917 the Wołomin settlement was established from combined villages of Wołomin, Helenówka, Lipiny, Ludwikówek, Sławek, Wiktoryn, Wołominek; town privileges 1919; 13–15 August 1920 during the battle of Ossów the town counterattacked the Soviet army; in the interwar period extension of plants (e.g. metal plant, numerous handicraft workshops). During the German occupation, 1940–42 ghetto (ca. three thousand people, 4 October 1942 approx. 2.4 thousand deported to the Treblinka extermination camp, 620 people killed on site), 1943 a labour camp for Jews; 1942–44 a conspiracy centre of the Home Army (AK) and National Armed Forces (NSZ); 30 July–6 September 1944 a nearby battle of the Soviet army with German panzer divisions; 1944–45 numerous arrests by the Office of Security (UB) and the People's Commissariat for Internal Affairs (NKWD) of the members of Polish independence organisations and their deportations far into the USSR. From 1945 to 1948 the area of operation of anti-communist organisations, e.g. units of the Freedom and Independence (WiN). County seat from 1952 to 1975 and since 1999.
This entry has been prepared based on the PWN source materials.