Ostrów Mazowiecka is a rural commune located in the Masovian Voivodeship, within Ostrów County, with its administrative seat in the town of Ostrów Mazowiecka. The commune was established on January 1, 1973, and between 1975 and 1998, it was part of the Ostrołęka Voivodeship. Covering an area of 283.71 km², the commune is rich in natural landscapes, with 53% of its land dedicated to agricultural use and 39% covered by forests. As of 2010, the population was 12,895.
The commune comprises numerous village administrations (sołectwa), including Antoniewo, Jasienica, and Komorowo, as well as other settlements without formal administrative status, such as Dudy, Kacpury, and Jeziorko. Architecturally, the area features a mix of historic buildings and modern structures, each bearing traces of the region's rich history. Local traditions are actively preserved, contributing to the area's unique cultural identity.
Bordered by communes such as Andrzejewo and Stary Lubotyń, Ostrów Mazowiecka benefits from cultural exchange with neighboring areas. Historically, the commune also includes former settlements like Grudzie and Podgrzybowskie, which add depth to its historical narrative.
Despite its modest size, Ostrów Mazowiecka offers a wealth of natural beauty and cultural resources, attracting both residents and visitors interested in exploring its scenic and historical heritage.