South Monrovia Island, California Demographics & Population 2026

Population Overview

South Monrovia Island is a small city located in California, within Los Angeles County. The total population is 6,830. It ranks as the 589th most populous out of 1,570 Census-designated places in California.

Age Demographics

The median age in South Monrovia Island is 33.8 years. This is 11% lower than the state median of 37.9 years.

Economy, Income & Housing

The median household income in South Monrovia Island is $104,444. This is 5% higher than the state median of $99,122. It is also 29% higher than the national median of $80,734. The poverty rate stands at 7.2%. This is 40% lower than the state poverty rate of 12.0%. The unemployment rate is 6.9%. This is 5% higher than the state rate of 6.6%. The median home value is $680,900. Housing costs are 7% lower than the state median of $734,700. The home-value-to-income ratio of 6.5x suggests that housing affordability is a significant concern for many residents. 66.2% of occupied housing units are owner-occupied. This homeownership rate is 18% higher than the state average of 55.9%.

Race & Ethnicity

The largest racial or ethnic group in South Monrovia Island is Hispanic or Latino, making up 72.6% of the population. White (non-Hispanic) residents account for 11.1%. The White (non-Hispanic) population (11.1%) is well below the state average of 33.8%. The Hispanic or Latino population is significantly higher than the state average (72.6% vs 40.2%). The Asian population (4.9%) is well below the state average of 15.3%.

Education

25.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 32% 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 73.4%.

Data Sources & Methodology

All demographic data for South Monrovia Island, 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.