Longrun is an unincorporated community in western Ozark County, Missouri, United States. It is located on Route 95, approximately northwest of Theodosia and southwest of Thornfield.Ava, Missouri, 30x60 Minute Topographic Quadrangle, USGS, 1985 Longrun's post office closed and mail delivery is now served by Theodosia.
Longrun was established in 1898 with a post office and school in Longrun Township near Longrun Creek. The post office was discontinued in 1980.
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