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 11,904. Monmouth is currently growing at a rate of 1.08% annually and its population has increased by 6.82% since the most recent census, which recorded a population of 11,144 in 2020.

The median household income in Monmouth is $69,170 with a poverty rate of 16.07%. The median age in Monmouth is 27.1 years: 26.4 years for males, and 27.4 years for females. For every 100 females there are 92.7 males.

11.9K
Total Population
5,317
Density (mi²)
127 1.08%
Growth

Monmouth Population

Monmouth Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202611,9041271.08%
202511,7771261.08%
202411,651760.66%
202311,575530.46%
202211,5222622.33%
202111,2601351.21%
202011,1446165.85%
201910,528690.66%
201810,4591161.12%
201710,3431881.85%
201610,1552732.76%
20159,882840.86%
20149,798-21-0.21%
20139,819250.26%
20129,794650.67%
20119,7291791.87%
20109,550160.17%
20007,7411,45323.11%
19906,28869412.41%
19805,5943576.82%
19705,2373,008134.95%
19602,22927313.96%
19501,956991102.69%
1940965596.51%
193090632455.67%
19205828918.05%
1910493-113-18.65%
1900606339126.97%
188026700%

Median Age

Overall: 27.1 years
Female: 27.4 years
Male: 26.4 years

Monmouth Adults

There are 9,139 adults, (1,353 of whom are seniors) in Monmouth.

Sex Ratio

Female: 5,932 (51.9%)
Male: 5,496 (48.1%)

Demographics

The racial composition of Monmouth includes 75.27% White, 5.02% other race, and smaller percentages for Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White8,60275.27%
Two or more races1,56813.72%
Other race5745.02%
Black or African American2131.86%
Asian2101.84%
Native American1701.49%
Native Hawaiian or Pacific Islander910.8%
Race
Population ↓
Percentage (of total)
Two or more races9578.37%
White5815.08%
Other race5745.02%
Black or African American800.7%
Native American770.67%
Native Hawaiian or Pacific Islander50.04%
Race
Population ↓
Percentage (of total)
White8,02170.19%
Two or more races6115.35%
Asian2101.84%
Black or African American1331.16%
Native American930.81%
Native Hawaiian or Pacific Islander860.75%

Monmouth Marital Status

Economics and Income Statistics

Monmouth 's average per capita income is $42,788. Household income levels show a median of $69,170. The poverty rate stands at 16.07%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median ↓
Mean
Married Families$97,461-
Families$90,208$100,572
Households$69,170$86,999
Non Families$37,869$58,103

$42,788

Average Income

$69,170

Median Household Income

16.07%

Poverty Rate

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)