Tłuszcz is an urban-rural municipality in the Masovian Voivodeship, located in Wołomin County, with the town of Tłuszcz serving as its administrative seat. Between 1975 and 1998, the municipality belonged to the Ostrołęka Voivodeship. Demographic data shows that the number of inhabitants increased from 18,371 in 2004 to 20,109 in 2019, indicating the region's development. The municipality covers an area of 102.83 km², with agricultural land accounting for 67% of this area, highlighting the importance of farming in the local economy. Tłuszcz Municipality also features a rich structure of villages, including Białki, Chrzęsne, Dzięcioły, and Wólka Kozłowska.
In Tłuszcz, one can observe architecture typical of small Polish towns, with single-family homes, historic buildings, and modern structures. It is also worth noting the local traditions and culture, which remain vibrant within the community and are often showcased during organized festivals and local events. Historically, the area around Tłuszcz has been inhabited since the 18th century, which is reflected in the presence of numerous monuments and historical sites. An interesting fact is that Tłuszcz Municipality constitutes 10.76% of the area of Wołomin County, and neighboring municipalities such as Dąbrówka, Jadów, and Strachówka form a regionally diverse area that fosters integration among local communities. With its agricultural character, rich demographics, and fascinating history, Tłuszcz Municipality serves as an interesting example of the development of local government units in Poland.