Pin Oak Community is an unincorporated community in Warren County, in the U.S. state of Missouri.. History. A post office called Pin Oak was established in 1854, and remained in operation until 1876. The community was named for a grove of pin oak trees near the original town site.Pinhook is an inactive village in Mississippi County, Missouri, United States.The population was 30 at the 2010 census.. It was settled in the 1920s by sharecroppers. The community takes its name from a nearby ridge of the same name which in turn was so named on account it having the form of a pinhook. The community was flooded in May 2011 when the U.S. Army Corps of Engineers breached the ...
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