Kawaguchi, Saitama

Kawaguchi
川口市
View of downtown Kawaguchi
Location of Kawaguchi in Saitama Prefecture
Kawaguchi
Coordinates: 35°48′27.7″N 139°43′26.8″E / 35.807694°N 139.724111°E / 35.807694; 139.724111
CountryJapan
RegionKantō
PrefectureSaitama
Government
 • MayorYuriko Okamura (岡村ゆり子) - from February 2026
Area
 • Total
61.95 km2 (23.92 sq mi)
Population
 (1 April 2025)
 • Total
595,011
 • Density9,605/km2 (24,880/sq mi)
Time zoneUTC+9 (Japan Standard Time)
- TreeCamellia sasanqua
- FlowerLilium longiflorum
Phone number048-258-1110
Address2-1-1 Aoki, Kawaguchi-shi, Saitama-ken 332-0031
WebsiteOfficial website

Kawaguchi (川口市, Kawaguchi-shi) is a city located in southeastern Saitama Prefecture, Japan. As of 1 April 2025, the city had an estimated population of 595,011 in 293,582 households and a population density of 9605 persons per km2. The total area of the city is 61.95 square kilometres (23.92 sq mi). It is the Greater Tokyo Area's 8th most populated city (after passing Hachioji), and second largest in Saitama Prefecture, after eponymous Saitama.