Editing San Marino, California (section)

===2010===
The [[2010 United States census]]<ref name=":4">{{cite web|url=http://www.census.gov/2010census/popmap/ipmtext.php?fl=06:0668224|archive-url=https://archive.today/20140715032936/http://www.census.gov/2010census/popmap/ipmtext.php?fl=06:0668224|url-status=dead|archive-date=July 15, 2014|title=2010 Census Interactive Population Search: CA - San Marino city|publisher=U.S. Census Bureau|access-date=July 12, 2014}}</ref> reported that San Marino had a population of 13,147. The population density was {{convert|3,483.4|PD/sqmi|PD/km2|sp=us|adj=off}}. The racial makeup of San Marino was 5,434 (41.3%) [[White (U.S. Census)|White]] (37.1% Non-Hispanic White),<ref name="quickfacts.census.gov">{{cite web|url=http://quickfacts.census.gov/qfd/states/06/0668224.html|access-date=November 30, 2013|archive-url=https://web.archive.org/web/20120830003402/http://quickfacts.census.gov/qfd/states/06/0668224.html|archive-date=August 30, 2012|url-status=live|title=San Marino (City) QuickFacts from the US Census Bureau }}</ref> 55 (0.4%) [[African American (U.S. Census)|African American]], 5 (0.0%) [[Native American (U.S. Census)|Native American]], 7,039 (53.5%) [[Asian (U.S. Census)|Asian]], 2 (0.0%) [[Pacific Islander (U.S. Census)|Pacific Islander]], 198 (1.5%) from [[Race (United States census)|other races]], and 414 (3.1%) from two or more races. [[Hispanic (U.S. Census)|Hispanic]] or [[Latino (U.S. Census)|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 [[marriage|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%) [[POSSLQ|unmarried opposite-sex partnerships]], and 22 (0.5%) [[same-sex partnerships|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 [[family (U.S. Census)|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 {{convert|1,186.2|/mi2|/km2|disp=preunit|units&nbsp;|units|}}, 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.