Monmouth is a city in Polk County in the U.S. state of Oregon. It was named for Monmouth, Illinois, the origin of its earliest settlers. The population is 11,110 at the 2020 Census and it is part of the Salem Metropolitan Statistical Area.
Main Street looking east
Post office in Monmouth
Polk County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 87,433. The county seat is Dallas. The county is named for James Knox Polk, the 11th president of the United States.
Polk County Courthouse in Dallas
Agricultural field and tree near Perrydale