The 2010 United States Census reported that San Ramon had a population of 72,148. The population density

Population density

Population density is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, and particularly to humans...

 was 3,991.1 people per square mile (1,541.0/km²). The racial makeup of San Ramon was 38,639 (53.6%) White, 2,043 (2.8%) African American, 205 (0.3%) Native American, 25,713 (35.6%) Asian, 156 (0.2%) Pacific Islander, 1,536 (2.1%) from other races

Race (United States Census)

Race and ethnicity in the United States Census, as defined by the Federal Office of Management and Budget and the United States Census Bureau, are self-identification data items in which residents choose the race or races with which they most closely identify, and indicate whether or not they are...

, and 3,856 (5.3%) from two or more races. Hispanic or Latino of any race were 6,250 persons (8.7%).

The Census reported that 72,073 people (99.9% of the population) lived in households, 52 (0.1%) lived in non-institutionalized group quarters, and 23 (0%) were institutionalized.

There were 25,284 households, out of which 11,988 (47.4%) had children under the age of 18 living in them, 16,318 (64.5%) were opposite-sex married couples

Marriage

Marriage is a social union or legal contract between people that creates kinship. It is an institution in which interpersonal relationships, usually intimate and sexual, are acknowledged in a variety of ways, depending on the culture or subculture in which it is found...

 living together, 1,997 (7.9%) had a female householder with no husband present, 850 (3.4%) had a male householder with no wife present.