Pine Lawn is a city in St. Louis County, Missouri, United States. The population was 3,275 at the 2010 census. Geography. Pine Lawn is located at (38.695101, 90.275543). According to the United States Census Bureau, the city has a total area of 0.61 ...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.
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