|Alt names||Marion||source: USGS, GNIS Digital Gazetteer (1994) GNIS29014461|
|Located in||Mercer, Missouri, United States|
- source: Getty Thesaurus of Geographic Names
- the text in this section is copied from an article in Wikipedia
Mercer is a city in Mercer County, Missouri, United States. The population was 318 at the 2010 census,a 7% decrease in population from the 2000 census at which time the population was 342.