[1] Iwasuki Ward is within the Kantō Plain, in the northeast portion of Saitama City.

Iwatsuki-ku is surrounded by Minuma-ku (west), Midori-ku (southwest), and the cities of Kawaguchi (south), Koshigaya (southeast), Kasukabe (northeast), Shiraoka (north), and Hasuda (northwest).

The modern town of Iwatsuki created within Minamisaitama District, Saitama with the establishment of the municipalities system on April 1, 1889.

On May 3, 1954, Iwatsuki merged with the neighboring villages of Niiwa, Wado, Kawadori, Kashiwazaki, Kawai and Jionji and was elevated to city status on July 1, 1954.

[2] Iwatsuki is known as the "City of Dolls" (人形のまち Ningyō no Machi) due to a history of doll-making that dates back to the 17th century.