Sinkin is an extinct town in northern Shannon County, in the U.S. state of Missouri. The community was located on a sharp meander in Sinking Creek at an area known as The Sinks where the stream goes underground for a short distance.The Sinks, MO, 7.5 Minute Topographic Quadrangle, USGS, 1968 (1985 rev.)
A post office called Sinkin was established in 1869, and remained in operation until 1933. The community took its name from nearby Sinking Creek.
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