is a district located in Chiba Prefecture, Japan.
As of 2011, the district has an estimated population of 43,480 and a density of 845 persons per km2. The total area is 51.48 km2.
There are two towns within the district. Sakae Shisui
District timeline January 1, 1957 - Parts of Yotsukaidō merged into the city of Sakura. September 1, 1964 - The village of Shiroi gained town status. April 1, 1981 - The town of Yotsukaidō gained city status. April 1, 1985 - The village of Tomisato gained town status. April 1, 1992 - The town of Yachimata gained city status. April 1, 1996 - The town of Inzai gained city status. April 1, 2001 - The town of Shiroi gained city status. April 1, 2002 - The town of Tomisato gained city status. March 23, 2010 - The villages of Inba and Motono merged into the city of Inzai.
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