Ōmiya (大宮区 Ōmiya-ku) is one of ten wards of the city of Saitama, in Saitama Prefecture, Japan, and is located in the northeastern part of the city. As of 1 February 2016, the ward had an estimated population of 113,742 and a population density of 8,890 persons per km². Its total area was 12.80 square kilometres (4.94 sq mi). Although Urawa-ku is the governmental center of Saitama City, Ōmiya-ku is the most active commercial and business centre in both Saitama City and Saitama Prefecture thanks to its transport infrastructure, especially railways connected at Ōmiya Station.