Lake Mathews first appeared as a
census designated place in the
2010 U.S. census. The median age was 41.6 years. The age distribution was 21.3% under the age of 18, 8.5% aged 18 to 24, 23.9% aged 25 to 44, 27.7% aged 45 to 64, and 18.6% who were 65 years of age or older. For every 100 females, there were 103.1 males, and for every 100 females age 18 and over there were 101.9 males age 18 and over. There were 1,880 households, out of which 31.0% had children under the age of 18 living in them. Of all households, 61.3% were married-couple households, 4.1% were
cohabiting-couple households, 15.6% were households with a male householder and no spouse or partner present, and 19.0% were households with a female householder and no spouse or partner present. About 16.2% of all households were made up of individuals and 7.7% had someone living alone who was 65 years of age or older. The average household size was 3.17. There were 1,498
families (79.7% of all households).
Income and poverty The median household income in 2023 was $102,700, and the
per capita income was $34,329. About 5.9% of families and 7.4% of the population were below the poverty line. ==Education==