Nishi-ku (西区) is a ward of the city of Sakai in Osaka Prefecture, Japan. The ward has an area of 28.62 km² and a population of 133,583. The population density is 4,667 per square kilometer. The name means "West Ward."
The wards of Sakai were established when Sakai became a city designated by government ordinance on April 1, 2006.
- 西区役所 ： 堺市ホームページ (Ward office official home page) (Retrieved on June 23, 2009)
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- Ward office official webpage (in Japanese)
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