ostrołęcki CountyVoivodeship: mazowieckieMunicipalities (11)Baranowo (6 units)Czarnia (4 units)Czerwin (12 units)Goworowo (12 units)Kadzidło (10 units)Lelis (4 units)Myszyniec (6 units)Olszewo-Borki (7 units)Rzekuń (5 units)Troszyn (10 units)Łyse (3 units)