Numerous studies have been conducted to reveal the diversity of mammals in Türkiye, primarily including biodiversity projects carried out nationwide by the Ministry of Agriculture and Forestry. Understanding the geographical distribution of species is crucial for biodiversity conservation, and the mammal diversity in each studied region will play a significant role. The data from this study were compared with literature data from various fields, especially regarding geographical and climatic differences; statistical analyses were conducted on species richness, Shannon entropy, and the Jaccard index. Thirty-six species were evaluated, with two new records (Dryomys nitedula and Felis silvestris) from Ağrı province. Total differences in species composition (βjac) between Ağrı and other regions ranged between 0,22-0,62 for medium and large-sized mammals, 0.62–0.92 for small mammals, and 0.53–0.80 for all mammals. The findings suggest that the distribution of mammal species in Ağrı is highly similar to that of Eastern Anatolian provinces such as Van and Bingöl. Conversely, when compared with studies from the Mediterranean and Aegean regions, significant differences in species diversity and composition are evident. This study aims to contribute to regional biodiversity knowledge and global conservation efforts by filling existing data gaps.