Located in northwestern Saitama Prefecture, Yorii is on the central reaches of the Arakawa River, just downstream of Nagatoro, and is approximately 70 kilometers from downtown Tokyo.

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

The town of Yorii was created within Hanzawa District, Saitama with the establishment of the modern municipalities system on April 1, 1889.

[citation needed] In February 1955, the town expanded by annexing the neighboring villages of Orihara, Hachigata, Obusuma, and Yodo.

[citation needed] Yorii has a mayor-council form of government with a directly elected mayor and a unicameral town council of 16 members.