St. John is an unincorporated community in Putnam County, in the U.S. state of Missouri.
History St. John was laid out in 1846 in Section 8 of western Sherman Township.1916 Map of Sherman Township, Putnam County, Missouri, accessed 15 August 2021. A post office called Saint John was established in 1849, and remained in operation until 1908. A post office in Delpha in section 1 of eastern Sherman Township established in 1891 also closed in 1908. The West Liberty post office also closed in 1908.
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