Rio del Mar first appeared as an unincorporated community in the
1980 U.S. census; The census reported that 99.8% of the population lived in households, 0.2% lived in non-institutionalized group quarters, and no one was institutionalized. 99.4% of residents lived in urban areas, while 0.6% lived in rural areas. The age distribution was 17.1% under the age of 18, 6.7% aged 18 to 24, 16.9% aged 25 to 44, 31.9% aged 45 to 64, and 27.4% who were 65 years of age or older. The median age was 51.5 years. For every 100 females, there were 92.2 males, and for every 100 females age 18 and over, there were 89.5 males age 18 and over.
Income and poverty The median household income in 2023 was $150,313, and the
per capita income was $91,497. About 1.6% of families and 3.1% of the population were below the poverty line.
2010 census At the
2010 census Rio del Mar had a population of 9,216. The population density was . The racial makeup of Rio del Mar was 8,310 (90.2%) White, 61 (0.7%) African American, 50 (0.5%) Native American, 313 (3.4%) Asian, 7 (0.1%) Pacific Islander, 188 (2.0%) from
other races, and 287 (3.1%) from two or more races. Hispanic or Latino of any race were 899 people (9.8%). The census reported that 9,210 people (99.9% of the population) lived in households, 6 (0.1%) lived in non-institutionalized group quarters, and no one was institutionalized. There were 3,916 households, 1,050 (26.8%) had children under the age of 18 living in them, 2,082 (53.2%) were
opposite-sex married couples living together, 337 (8.6%) had a female householder with no husband present, 139 (3.5%) had a male householder with no wife present. There were 228 (5.8%)
unmarried opposite-sex partnerships, and 32 (0.8%)
same-sex married couples or partnerships. 1,008 households (25.7%) were one person and 486 (12.4%) had someone living alone who was 65 or older. The average household size was 2.35. There were 2,558 families (65.3% of households); the average family size was 2.82. The age distribution was 1,820 people (19.7%) under the age of 18, 549 people (6.0%) aged 18 to 24, 1,932 people (21.0%) aged 25 to 44, 3,221 people (35.0%) aged 45 to 64, and 1,694 people (18.4%) who were 65 or older. The median age was 47.0 years. For every 100 females, there were 92.6 males. For every 100 females age 18 and over, there were 90.2 males. There were 4,924 housing units at an average density of 1,067.6 per square mile, of the occupied units 2,848 (72.7%) were owner-occupied and 1,068 (27.3%) were rented. The homeowner vacancy rate was 1.9%; the rental vacancy rate was 8.4%. 6,686 people (72.5% of the population) lived in owner-occupied housing units and 2,524 people (27.4%) lived in rental housing units. ==Government==