Monmouth is a city located in Polk County Oregon. With a 2020 population of 10,820, it is the 48th largest city in Oregon and the 2935th largest city in the United States . Monmouth is currently growing at a rate of 1.09% annually and its population has increased by 13.49% since the most recent census, which recorded a population of 9,534 in 2010. Monmouth reached it's highest population of 10,820 in 2021. Spanning over 2 miles, Monmouth has a population density of 4,979 people per square mile.
The average household income in Monmouth is $52,511 with a poverty rate of 27.80%. The median rental costs in recent years comes to $1,014 per month, and the median house value is $225,100. The median age in Monmouth is 23.6 years, 23.5 years for males, and 23.9 years for females.