Miamisburg is a city in Montgomery County, Ohio, Unite States. The population was 19,489 at the 2000 census. Miamisburg is known for its large industry (mainly for its nuclear operations during World War II) and retail factors (such as the Dayton Mall), but is mainly known for being the home to the Miamisburg Mound. Many large corporations are located in Miamisburg such as LexisNexis, Dayco, and Isotec. Miamisburg borders Dayton, Centerville, West Carrollton, Germantown, and Springboro. Miamisburg is part of the Greater Dayton Area. Miamisburg's mascot is the Viking. Miamisburg is pronounced locally Mye-am-uhs-burg, rather than Mye-am-ees-burg.