On April 1, 2004 - The former cities of Shimizu and Shizuoka were merged to create the designated city of Shizuoka. The former city of Shimizu is co-extensive to current Shimizu-ku.
On January 1, 2009 - The town of Okabe (from Shida District) was merged into the expanded city of Fujieda. Shida District was dissolved as a result of this merger.
On March 23, 2010 - The town of Arai (from Hamana District) was merged into the expanded city of Kosai. Hamana District was dissolved as a result of this merger.