Saitama Prefecture Miyashiro has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall.

[2] Per Japanese census data,[3] the population of Miyashiro has recently plateaued after a long period of growth.

The villages of Monma and Suka were created within Minamisaitama District, Saitama with the establishment of the modern municipalities system on April 1, 1889.

Miyashiro has a mayor-council form of government with a directly elected mayor and a unicameral town council of 14 members.

In terms of national politics, the town is part of Saitama 11th district of the lower house of the Diet of Japan.