Proper noun
A number of places in the United States:
An unincorporated community in Crittenden County, Arkansas.
A city, the county seat of Pulaski County, Illinois.
A city, the county seat of Linn County, Kansas.
A city in Holt County, Missouri.
A town, the county seat of Campbell County, South Dakota.
(US, colloquial) Synonym of Saint Louis, Missouri, USA.
Source: en.wiktionary.orgA Memorial Day Ceremony was held on Saturday at the Mound City National Cemetery honoring and remembering the people who served in the country's Armed Forces. Source: Internet
St. Louis was at one time known as Mound City by the European Americans, because of the numerous surviving prehistoric mounds, since lost to urban development. Source: Internet