Suntō District was established in the July 22, 1878 cadastral reforms initiated by the
Meiji government with five towns, one post station and 155 villages. • In a round of consolidation on April 1, 1889, this was reduced to three towns (Numazu, Hara and Gotemba) and 24 villages. • Oyama Village was established as Oyama Town on August 1, 1912. • Numazu Town was elevated to city status on July 1, 1923. • Susono Town was established on April 1, 1952. • In an around of consolidation from 1955 to 1957, Gotemba was elevated to city status on February 11, 1955. The remaining number of villages reduced to two. • Nagaizumi Village was promoted to town status on April 1, 1960. • Shimizu Village was promoted to town status on November 3, 1963, leaving the district with five towns and no villages. • Hara Town was annexed by Numazu on April 1, 1968. • Susono Town was elevated to city status on January 1, 1971.