Sayama , formerly known as Irumagawa, is a city located in Saitama, Japan. Sayama translates as "sitting on a mountain. The city was founded on July 1,1954. As of October 1, 2010, the city had an estimated population of 157,453and a density of 3,210.71 persons perSquare kilometers. The city's total area is 49.04Square kilometers. The current Mayor is Yukinari Nakagawa() elected in 2003. Sayama is bordered by the cities of Kawagoe, Tokorozawa, Iruma, Hann, and Hidaka.