San Leandro, CA has a population of 89,039 and is the 364th largest city in the United States. The population density is 6,674 per sq mi which is 2772% higher than the California average and 7266% higher than the national average. The median age in San Leandro is 41 which is approximately 13% higher than the California average of 36. In San Leandro, 55% of the population over 15 years of age are married, 49% speak English and 20% speak Spanish. 51% of San Leandro residents were born in California, 11% were born out of state, 1% were born outside of the United States and 36% were foreign born.