Monte Rio, California Demographics & Population 2026

A note before these figures: with a population of 876, Monte Rio'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

Monte Rio is a small community located in California, within Sonoma County. The total population is 876. It ranks as the 1101st most populous out of 1,570 Census-designated places in California.

Age Demographics

The median age in Monte Rio is 62.9 years. This is 66% higher than the state median of 37.9 years. Only 1.3% of residents are under 18, indicating fewer families with children. 11.0% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Monte Rio is $63,750. This is 36% lower than the state median of $99,122. It is also 21% lower than the national median of $80,734. The poverty rate stands at 12.3%. This is 3% higher than the state poverty rate of 12.0%. The unemployment rate is 9.5%. This is 44% higher than the state rate of 6.6%. The median home value is $652,000. Housing costs are 11% lower than the state median of $734,700. The home-value-to-income ratio of 10.2x suggests that housing affordability is a significant concern for many residents. 82.8% of occupied housing units are owner-occupied. This homeownership rate is 48% higher than the state average of 55.9%.

Race & Ethnicity

Monte Rio has a predominantly White (non-Hispanic) population, comprising 87.8% of all residents. Hispanic or Latino residents account for 11.0%. The White (non-Hispanic) population is significantly higher than the state average (87.8% vs 33.8%). The Hispanic or Latino population (11.0%) is well below the state average of 40.2%.

Education

44.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 21% higher 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 96.8%.

Data Sources & Methodology

All demographic data for Monte Rio, 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.