Omachi is located in Nagano-shi city, Japan at the 36.5, 137.8667 coordinates. Distance from Omachi to other cities. are listed below, click on the city name to find distance between. Distance from Ōmachi to Matsumoto 31 km, to Ueda 39 km, to Iida 109 km. The green marker indicates the location of Ōmachi.