Kentfield, CA has a population of 6,907 and is the 5,231st largest city in the United States. The population density is 2,283 per sq mi which is 882% higher than the California average and 2420% higher than the national average. The median age in Kentfield is 48 which is approximately 32% higher than the California average of 36. In Kentfield, 66% of the population over 15 years of age are married, 88% speak English and 3% speak Spanish. 48% of Kentfield residents were born in California, 37% were born out of state, 2% were born outside of the United States and 13% were foreign born.