San Marino first appeared as a
census-designated place in the
1920 U.S. census. There were 4,208 households in San Marino, of which 35.8% had children under the age of 18 living in them. Of all households, 69.6% were married-couple households, 8.7% were households with a male householder and no spouse or partner present, and 20.1% were households with a female householder and no spouse or partner present. About 12.5% of all households were made up of individuals, and 8.4% had someone living alone who was 65 years of age or older.
2010 census The
2010 United States census reported that San Marino had a population of 13,147. The population density was . The racial makeup of San Marino was 5,434 (41.3%)
White (37.1% Non-Hispanic White), 55 (0.4%)
African American, 5 (0.0%)
Native American, 7,039 (53.5%)
Asian, 2 (0.0%)
Pacific Islander, 198 (1.5%) from
other races, and 414 (3.1%) from two or more races.
Hispanic or
Latino of any race were 855 persons (6.5%). The census reported that 13,066 people (99.4% of the population) lived in households, 81 (0.6%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized. There were 4,330 households, out of which 1,818 (42.0%) had children under the age of 18 living in them, 3,220 (74.4%) were
opposite-sex married couples living together, 367 (8.5%) had a female householder with no husband present, 143 (3.3%) had a male householder with no wife present. There were 42 (1.0%)
unmarried opposite-sex partnerships, and 22 (0.5%)
same-sex married couples or partnerships. Of all households, 531 (12.3%) were made up of individuals, and 359 (8.3%) had someone living alone who was 65 years of age or older. The average household size was 3.02. There were 3,730
families (86.1% of all households); the average family size was 3.28. The population was spread out, with 3,422 people (26.0%) under the age of 18, 712 people (5.4%) aged 18 to 24, 2,353 people (17.9%) aged 25 to 44, 4,351 people (33.1%) aged 45 to 64, and 2,309 people (17.6%) who were 65 years of age or older. The median age was 45.3 years. For every 100 females, there were 92.4 males. For every 100 females age 18 and over, there were 87.7 males. There were 4,477 housing units at an average density of , of which 3,959 (91.4%) were owner-occupied, and 371 (8.6%) were occupied by renters. The homeowner vacancy rate was 0.5%; the rental vacancy rate was 6.5%; 11,834 people (90.0% of the population) lived in owner-occupied housing units and 1,232 people (9.4%) lived in rental housing units.
2000 census As of the census of 2000, there were 12,945 people, 4,266 households, and 3,673 families residing in the city. The population density was . There were 4,437 housing units at an average density of . The racial makeup of the city was 51.98%
White, 0.15%
African American, 0.05%
Native American, 47.7%
Asian, 0.08%
Pacific Islander, 1.04% from
other races, and 2.30% from two or more races.
Hispanic or
Latino of any race were 3.25% of the population. More than one-third of the city's population, 33.3%, was Chinese. There were 4,266 households, out of which 42% had children under the age of 18 living with them, 75% were married couples living together, 8.6% had a female householder with no husband present, and 13.9% were non-families. Of all households 12% were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older. The average household size was 3.03 and the average family size was 3.29. In the city, the age distribution of the population showed 26.5% under the age of 18, 6.4% from 18 to 24, 21.5% from 25 to 44, 29.4% from 45 to 64, and 16.2% who were 65 years of age or older. The median age was 43 years (this was older than average age in the U.S.). For every 100 females, there were 93.1 males. For every 100 females age 18 and over, there were 89.1 males. ==Arts and culture==