Dee ihe na-aga n'ihu maka paragraf a - Mgbe agha Polish-Russian gasịrị, Ostrołęka ghọrọ otu n'ime obodo ndị kacha ebibi. Ọ bụ ezie na ọ tara ahụhụ dị ukwuu, Ostrołęka nọgidere bụrụ obodo district nke Płock's Province. Akụ na ụba Ostrołęka dara n'ụzọ dị ukwuu. Ihe fọrọ nke nta ka ọ bụrụ ndị ọrụ aka nile nke obodo ahụ dara ogbenye. Ọ bụ nanị ihe ndị e mepụtara n'ụlọ ọrụ amber nke Ostrołęka ka a na-enyefe na Europe nile. Ostrołęka nwetara nkwụghachi ego site n'aka Treasury nke Tsar. Otú ọ dị, o were ogologo oge tupu ya ebilie site n'ọdịda ya. N'afọ 1847 ihe ncheta nke na-echeta mmeri ndị agha Russia n'agha nke Ostrołęka
e welitere na 26 Mee 1831. N'oge nnupụisi nke Jenụwarị, ọ nweghị agha ọ bụla mere na nso Ostrołęka, ebe Tsar debere ndị agha Russia buru ibu na obodo ahụ na-echegbu onwe ya maka Nnupụisi Kurp ọzọ. Na 1864, mgbe iwu gọọmentị Russia nyere, ndị Benedictine hapụrụ Ostrołęka ma tinye ụlọ ebe obibi ndị mọnk n'okpuru ikike nke ndị ụkọchukwu parish.