Monmouth Flag

Monmouth

County:
Polk County
County Seat:
No
Area (mi²):
2.239
State:
Oregon

Monmouth is a city located in Polk County, Oregon. Monmouth has a 2026 population of 11,651. Monmouth is currently growing at a rate of 0.66% annually and its population has increased by 4.55% since the most recent census, which recorded a population of 11,144 in 2020.

11.7K
Total Population
5,204
Density (mi²)
76 0.66%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)