Koolwijk (South Holland) is a hamlet in the Dutch province of South Holland. It is a part of the municipality of Krimpenerwaard, and lies about 7 km south of Gouda.
The statistical area "Koolwijk", which also can include the surrounding countryside, has a population of around 100.Statistics Netherlands (CBS), Statline: Kerncijfers wijken en buurten 2003–2005 . As of 1 January 2005.
Until 2015, Koolwijk was part of Vlist.
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