Kosi Kalan is situated in BrijBhoomi, i.e., the area where lord krishna has spent his childhood days . Town was named Kosi for being treasury of NandBaba (Father of lord Krishna) (as Kosh means Treasure). This town is a hub of cultural and commercial activities. There is another saying about name, People believe it got its name from Kushasthali which mean place of Kush, Kush is son of lord Ram. The town is situated on the Delhi-Agra highway(NH-2)at 100 km milestone. The town is equally famous for its varied culture (since it is situated at tri-junction of Uttar pradesh, Rajasthan and Haryana) as for its industrial development.