In the early 19th century, the local Jews made efforts to create their own kahal. To this end, they started to strive for building a synagogue, a cheder, a hospital for the poor and a cemetery. They succeeded in their efforts. I
n 1804 the Prussian government released the Jews from paying an annual fee of PLN 59 for the benefit of the kahal in Nasielsko. Most probably the first rabbi who held the office in 1816 was a sixty-two-year-old Lajbuś Tyzlewicz from Lublin. He was paid an annual salary of PLN 600. Anti-Semitic incidents occurred in Nowe Miasto on 15 May 1882. Similar ones were observed on 29 November 1935. Hassidim from Góra Kalwaria enjoyed serious influence among the local Jews.
After the outbreak of World War II, some 750 Jews escaped, or were displaced by the Germans. A larger group of fugitives settled in Radzymin and Warsaw. Out of about 1500 people, a half survived.
On 1 November 1941, a ghetto was established. It was a ghetto which together with the one in Strzegowo was formed as the latest one in the district of Ciechanów. It covered the northern and eastern part of the Market and Kościelna and Senatorska Streets. It was fenced. 1200 Jews from Ciechanów and some 750 Jews from Drobin were placed in it. As a result of bad conditions in the ghetto, 300 people died there. On 6 July 1941, about 300 ghetto dwellers were transported to the camp and prison in Pomiechówek. The ghetto was ultimately liquidated on 18 June 1942. Its dwellers were displaced to the ghetto in Płońsk. Some of them were taken directly to the extermination camp in Auschwitz.
- M.Grynberg, Żydzi w rejencji ciechanowskiej 1939-1942, Warszawa 1984.
- J.Szczepański, Społeczność żydowska Mazowsza w XIX-XX wieku, Pułtusk 2005.