Poinsett County is located in northeast Arkansas. Crowley’s Ridge, a highland geologic anomaly that begins in southeast Missouri and ends in south central Arkansas, runs through the center of the county. A number of structures in Poinsett County are on the National Register of Historic Places, including the county courthouse and the office building of the Modern News newspaper in Harrisburg, the old Singer Community Building in Trumann, the Bacon Hotel in Whitehall, and the Marked Tree Lock and Siphons.