Andover, Missouri
Andover is an unincorporated community in northeast Harrison County, in the U.S. state of Missouri. The community is Missouri Route T six miles north of Blythedale and three quarter mile south of the Missouri-Iowa border. Interstate 35 passes three miles to the west. History. Andover had its start in 1873 when the railroad was extended to that point. A post office called Andover was established in 1872, and remained in operation until 1943.