Commerce is a Mississippi River village in Scott County, Missouri, United States. The population was 67 at the time of the 2010 census. In 178…Commerce is a Mississippi River village in Scott County, Missouri, United States. The population was 67 at the time of the 2010 census. In 1788, the present site of Commerce was first occupied by French settlers, making Commerce apparently the third-oldest present-site settlement in Missouri after St Louis and St. Charles as Ste. Genevieve was moved from its original location. A trading post established in 1803 served as the center of commerce for the region, hence the name of the settlement. In 1823, the circuit court ordered a board of commissioners to be appointed to lay out lots here.