2020 census As of the
2020 census, San Martin had a population of 7,008. The population density was . The median age was 43.2 years. 20.7% of residents were under the age of 18 and 18.9% were 65 years of age or older. For every 100 females, there were 110.6 males, and for every 100 females age 18 and over there were 112.8 males. The census reported that 97.3% of the population lived in households, 2.4% lived in non-institutionalized group quarters, and 0.4% were institutionalized. 88.5% of residents lived in urban areas, while 11.5% lived in rural areas. There were 1,980 households, of which 32.5% had children under the age of 18 living in them. Of all households, 61.1% were married-couple households, 5.0% were
cohabiting couple households, 18.1% were households with a male householder and no spouse or partner present, and 15.8% were households with a female householder and no spouse or partner present. About 15.6% of 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 3.44. There were 1,553
families (78.4% of all households).
2010 census The
2010 United States census reported that San Martin had a population of 7,027. The population density was . The racial makeup of San Martin was 4,329 (61.6%)
White, 27 (0.4%)
African American, 71 (1.0%)
Native American, 470 (6.7%)
Asian, 18 (0.3%)
Pacific Islander, 1,752 (24.9%) from
other races, and 360 (5.1%) from two or more races.
Hispanic or
Latino of any race were 3,249 persons (46.2%). The Census reported that 6,896 people (98.1% of the population) lived in households, 114 (1.6%) lived in non-institutionalized group quarters, and 17 (0.2%) were institutionalized. There were 1,993 households, out of which 812 (40.7%) had children under the age of 18 living in them, 1,267 (63.6%) were
opposite-sex married couples living together, 199 (10.0%) had a female householder with no husband present, 124 (6.2%) had a male householder with no wife present. There were 131 (6.6%)
unmarried opposite-sex partnerships, and 14 (0.7%)
same-sex married couples or partnerships. 279 households (14.0%) were made up of individuals, and 98 (4.9%) had someone living alone who was 65 years of age or older. The average household size was 3.46. There were 1,590
families (79.8% of all households); the average family size was 3.70. The population was spread out, with 1,780 people (25.3%) under the age of 18, 713 people (10.1%) aged 18 to 24, 1,613 people (23.0%) aged 25 to 44, 2,098 people (29.9%) aged 45 to 64, and 823 people (11.7%) who were 65 years of age or older. The median age was 38.5 years. For every 100 females, there were 103.9 males. For every 100 females age 18 and over, there were 106.9 males. There were 2,122 housing units at an average density of , of which 1,309 (65.7%) were owner-occupied, and 684 (34.3%) were occupied by renters. The homeowner vacancy rate was 1.9%; the rental vacancy rate was 1.7%. 4,491 people (63.9% of the population) lived in owner-occupied housing units and 2,405 people (34.2%) lived in rental housing units. According to
Forbes Magazine, San Martin is rated as one of the country's most expensive ZIP codes with a median home price of $824,390 in 2010, despite a drop in home value of almost 20% from 2008. ==Economy==