Monmouth, Oregon demographics

Monmouth, OR demographics: median age 27.1; 27.3% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Monmouth city, Oregon · Incorporated city · GEOID 4149550. The survey estimates a population of 11,428 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Monmouth is 27.1 years, with a 90% margin of error of 1.8 years. There are 3,621 households (±274). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	27.1 ±1.8	40.4 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
Under 18	2,289 ±376	20.0% ±3.3 pp	19.9%	22.0%
18–34	4,738 ±514	41.5% ±4.5 pp	22.5%	22.8%
35–64	3,048 ±467	26.7% ±4.1 pp	38.5%	38.0%
65 and older	1,353 ±267	11.8% ±2.3 pp	19.1%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
Male	5,496 ±286	48.1% ±2.5 pp	49.9%	49.5%
Female	5,932 ±288	51.9% ±2.5 pp	50.1%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
White alone	8,602 ±464	75.3% ±4.1 pp	74.6%	61.0%
Black or African American alone	213 ±144 · low precision	1.9% ±1.3 pp · low precision	1.9%	12.2%
American Indian and Alaska Native alone	170 ±88 · low precision	1.5% ±0.8 pp · low precision	1.1%	0.9%
Asian alone	210 ±137 · low precision	1.8% ±1.2 pp · low precision	4.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	91 ±103 · low precision	0.8% ±0.9 pp · low precision	0.4%	0.2%
Some other race alone	574 ±265	5.0% ±2.3 pp	5.2%	7.1%
Two or more races	1,568 ±363	13.7% ±3.2 pp	12.3%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
Not Hispanic or Latino	9,154 ±527	80.1% ±4.6 pp	85.3%	80.7%
Hispanic or Latino	2,274 ±525	19.9% ±4.6 pp	14.7%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 3,621
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
Married-couple family	1,641 ±252	45.3% ±6.1 pp	46.7%	46.9%
Other family: male householder, no spouse present	157 ±95 · low precision	4.3% ±2.6 pp · low precision	4.9%	5.1%
Other family: female householder, no spouse present	482 ±161	13.3% ±4.3 pp	10.1%	12.2%
Nonfamily: householder living alone	728 ±248	20.1% ±6.7 pp	28.4%	28.7%
Nonfamily: householder not living alone	613 ±202	16.9% ±5.4 pp	9.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 3,621
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
Households with people under 18	1,051 ±173	29.0% ±4.2 pp	27.2%	29.5%
Households without people under 18	2,570 ±313	71.0% ±6.8 pp	72.8%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 3,621
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
One-person nonfamily households	728 ±248	20.1% ±6.7 pp	28.4%	28.7%
Two-person households	1,309 ±282	36.2% ±7.3 pp	36.7%	33.8%
Three-person households	803 ±248	22.2% ±6.6 pp	15.0%	15.3%
Four-person households	461 ±163	12.7% ±4.4 pp	11.8%	12.6%
Five-person households	84 ±90 · low precision	2.3% ±2.5 pp · low precision	5.0%	5.9%
Six-person households	124 ±63 · low precision	3.4% ±1.7 pp	1.9%	2.2%
Seven or more people	112 ±80 · low precision	3.1% ±2.2 pp · low precision	1.2%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
Native	10,703 ±248	93.7% ±2.2 pp	90.2%	85.9%
Foreign born	725 ±248	6.3% ±2.2 pp	9.8%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 10,856
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
English only	8,998 ±536	82.9% ±4.8 pp	84.8%	77.7%
Spanish	1,568 ±490	14.4% ±4.5 pp	9.0%	13.6%
French, Haitian, or Cajun	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.3%	0.7%
German or other West Germanic	53 ±65 · low precision	0.5% ±0.6 pp · low precision	0.4%	0.5%
Russian, Polish, or other Slavic	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.8%	0.7%
Other Indo-European	69 ±76 · low precision	0.6% ±0.7 pp · low precision	1.0%	2.0%
Korean	109 ±110 · low precision	1.0% ±1.0 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	23 ±30 · low precision	0.2% ±0.3 pp · low precision	0.8%	1.1%
Vietnamese	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.6%	0.5%
Tagalog, including Filipino	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.3%	0.6%
Other Asian and Pacific Island	36 ±36 · low precision	0.3% ±0.3 pp · low precision	1.1%	1.1%
Arabic	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.5%
Other and unspecified	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.5%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 6,213
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
Less than high school graduate	389 ±153	6.3% ±2.4 pp	8.2%	10.4%
High school graduate or equivalency	1,357 ±344	21.8% ±5.4 pp	22.4%	26.0%
Some college, no degree	1,791 ±428	28.8% ±6.6 pp	23.5%	19.1%
Associate’s degree	982 ±239	15.8% ±3.7 pp	9.1%	8.8%
Bachelor’s degree	1,033 ±258	16.6% ±4.0 pp	22.7%	21.6%
Graduate or professional degree	661 ±218	10.6% ±3.4 pp	14.1%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 11,151
Category	Count ± MOE	Share ± MOE (pp)	Oregon	U.S.
Same house	8,737 ±577	78.4% ±5.1 pp	86.0%	87.7%
Moved within same county	699 ±303	6.3% ±2.7 pp	7.0%	6.3%
Moved from a different county in the same state	950 ±339	8.5% ±3.0 pp	3.4%	3.1%
Moved from a different state	649 ±299	5.8% ±2.7 pp	3.0%	2.3%
Moved from abroad	116 ±126 · low precision	1.0% ±1.1 pp · low precision	0.5%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

3.4% of Monmouth residents (±1.3 percentage points) had no health insurance coverage when surveyed, compared with 5.9% in Oregon and 8.4% nationally. 90.9% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Monmouth	Oregon	U.S.	Compared with Oregon
People without health insurance Civilian noninstitutionalized population	3.4% ±1.3 pp	5.9%	8.4%	Lower
Households with a broadband subscription Households	90.9% ±3.7 pp	92.4%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	8.4% ±3.3 pp	7.2%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Monmouth . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Monmouth housing and cost context or return to the city profile.