RADZYMIN (Rus. Radimin), town in Warszawa province, E. central Poland. Founded during the middle of the 17th century as a private town by a privilege granted by King Ladislaus IV of Poland, it grew rapidly during the 19th century as a result of Jewish enterprise. The synagogue was erected in 1840. There were 432 Jews (about 33% of the total population) in Radzymin in 1827, 1,278 (c. 70%) in 1856, 2,133 (c. 53%) in 1897, 2,209 (55% of the population) in 1921, and 3,559 (52.6%) in 1931. Radzymin was a center of Ḥasidism, and during the 19th century it was the home of Jacob Aryeh Guterman, founder of the *Radzymin dynasty of ẓaddikim. A yeshivah which gained renown was also established by the dynasty in Radzymin. Zionists played an important role in the public life of the town and in the municipal elections of 1927 they won seven of the ten seats reserved for Jews. The community council, elected in 1931, included six Zionists and two members of Agudat Israel. Among religious, educational, and charitable institutions in Radzymin was the Linat ha-Ẓedek ("Hospice for the Poor") established in 1910.