Black Oak is a community in White River Township, Washington County, Arkansas, United States."Feature Detail Report for: Black Oak, Arkansas." USGS. Retrieved October 5, 2010. It is located between Greenland and Elkins and lies six miles southeast of Fayetteville.
The community lies along the west bank of the Middle Fork of the White River. The community of Sulphur City lies on the east bank of the river approximately 1.5 miles to the southeast.Sulphur City. AR., 7.5 Minute Topographic Quadrangle, USGS, 1973 (1990 rev.)
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