Monmouth, Illinoiscity in Warren County, Illinois, United States / From Wikipedia, the free encyclopedia Monmouth is a city in Illinois in the United States. This short article about a place or feature in the United States can be made longer. You can help Wikipedia by adding to it.
Monmouth is a city in Illinois in the United States. This short article about a place or feature in the United States can be made longer. You can help Wikipedia by adding to it.