Ōme (青梅市, Ōme-shi) is a city located in the western portion of Tokyo Metropolis, Japan. As of 1 February 2016, the city had an estimated population of 136,071, and a population density of 1320 persons per km². Its total area is 103.31 square kilometres. is located in the Okutama Mountains of western Tokyo, bordered by Saitama Prefecture to the north. The Tama River flows through the city. The area of present-day Ōme was part of ancient Musashi Province. Ōme developed in the Edo period as a post station on the Ōme-Kaidō highway. In the post-Meiji Restoration cadastral reform of July 22, 1878, the area became part of Nishitama District in Kanagawa Prefecture. The town of Ōme was created on April 1, 1889, with the establishment of municipalities law. Nishitama District was transferred to the administrative control of Tokyo Metropolis on April 1, 1893. Ōme was elevated to city status on April 1, 1951, by merging with the neighbouring villages of Kasumi and Chōfu. Later in 1955, four additional villages (Yoshida, Mita, Kosoki, and Nariki) merged with Ōme.