Minamiuonuma is a city situated in the Niigata Prefecture of Japan. It covers a total land area of 584.55 square kilometers, which is equivalent to approximately 225.70 square miles.
As of December 1, 2020, the city had an estimated population of 55,354 residents living in 20,047 households. The population density of the region is recorded at 96.1 persons per square kilometer.