Monmouth, California Demographics & Population 2026

A note before these figures: with a population of 115, Monmouth's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Monmouth is a small community located in California, within Fresno County. The total population is 115. It ranks as the 1444th most populous out of 1,570 Census-designated places in California.

Age Demographics

The median age in Monmouth is 28.9 years. This is 24% lower than the state median of 37.9 years. With 36.5% of the population under 18, Monmouth has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in Monmouth is $43,906. This is 56% lower than the state median of $99,122. It is also 46% lower than the national median of $80,734. The poverty rate stands at 20.9%. This is 74% higher than the state poverty rate of 12.0%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The unemployment rate is 2.9%. This is 57% lower than the state rate of 6.6%. The median home value is $241,700. Housing costs are 67% lower than the state median of $734,700. The home-value-to-income ratio is 5.5x. 37.9% of occupied housing units are owner-occupied. This homeownership rate is 32% lower than the state average of 55.9%.

Race & Ethnicity

The largest racial or ethnic group in Monmouth is Hispanic or Latino, making up 72.2% of the population. Black or African American residents account for 16.5%. The White (non-Hispanic) population (11.3%) is well below the state average of 33.8%. The Black or African American population is significantly higher than the state average (16.5% vs 5.2%). The Hispanic or Latino population is significantly higher than the state average (72.2% vs 40.2%).

Education

9.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 75% lower than the state rate of 37.1%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 86.1%.

Data Sources & Methodology

All demographic data for Monmouth, California is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against California state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,570 Census-designated places in California. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.