Harviell is an unincorporated community and census-designated place in Butler County, Missouri, United States. As of the 2010 census it had a population of 106.Harviell was founded in 1873 and is named for Simeon Harviell, an early citizen. A post office called Harviell has been in operation since 1874.Harviell is located at 36°39′53″N 90°28′20″W / 36.66472°N 90.47222°W / 36.66472; -90.47222, on Missouri Route 158 about 10 miles southwest of Poplar Bluff.According to the United States Census Bureau, the CDP has a total area of 1.8 square miles, of which 0.015 square miles, or 0.78%, is water.