Rancho Santa Fe first appeared as a
census-designated place in the
2000 U.S. census. The whole population lived in households. There were 1,194 households, out of which 27.3% included children under the age of 18, 66.4% were married-couple households, 2.8% were
cohabiting couple households, 19.8% had a female householder with no partner present, and 11.1% had a male householder with no partner present. 18.4% of households were one person, and 12.2% were one person aged 65 or older. The average household size was 2.64. There were 933
families (78.1% of all households).
Income and poverty In 2023, the US Census Bureau estimated that the median household income was $236,429, and the
per capita income was $117,279. About 0.0% of families and 2.4% of the population were below the poverty line.
2010 census At the
2010 census Rancho Santa Fe had a population of 3,117. The population density was . The racial makeup of Rancho Santa Fe was 2,910 (93.4%) White, 10 (0.3%) African American, 1 (0.0%) Native American, 87 (2.8%) Asian, 4 (0.1%) Pacific Islander, 45 (1.4%) from other races, and 60 (1.9%) from two or more races. Hispanic or Latino of any race were 176 people (5.6%). The whole population lived in households, no one lived in non-institutionalized group quarters and no one was institutionalized. There were 1,195 households, 364 (30.5%) had children under the age of 18 living in them, 848 (71.0%) were
opposite-sex married couples living together, 62 (5.2%) had a female householder with no husband present, 33 (2.8%) had a male householder with no wife present. There were 23 (1.9%)
unmarried opposite-sex partnerships, and 9 (0.8%)
same-sex married couples or partnerships. 213 households (17.8%) were one person and 124 (10.4%) had someone living alone who was 65 or older. The average household size was 2.61. There were 943 families (78.9% of households); the average family size was 2.93. The age distribution was 724 people (23.2%) under the age of 18, 142 people (4.6%) aged 18 to 24, 332 people (10.7%) aged 25 to 44, 1,178 people (37.8%) aged 45 to 64, and 741 people (23.8%) who were 65 or older. The median age was 51.3 years. For every 100 females, there were 96.4 males. For every 100 females age 18 and over, there were 93.5 males. There were 1,391 housing units at an average density of 204.9 per square mile, of the occupied units 1,010 (84.5%) were owner-occupied and 185 (15.5%) were rented. The homeowner vacancy rate was 2.4%; the rental vacancy rate was 12.3%. 2,674 people (85.8% of the population) lived in owner-occupied housing units and 443 people (14.2%) lived in rental housing units. The median household income was $188,859. Males had a median income of over $153,512 versus $71,667 for females. The per capita income for the CDP was $125,367. 3.2% of the population and 2.1% of families were below the poverty line. 2.3% under the age of 18 and 9.6% of those 65 and older were living below the poverty line. ==Politics==