Piedmont, CA has a population of 11,201 and is the 3,612th largest city in the United States. The population density is 6,590 per sq mi which is 2736% higher than the California average and 7174% higher than the national average. The median age in Piedmont is 46 which is approximately 29% higher than the California average of 36. In Piedmont, 76% of the population over 15 years of age are married, 85% speak English and 3% speak Spanish. 55% of Piedmont residents were born in California, 31% were born out of state, 1% were born outside of the United States and 13% were foreign born.