Kensington, CA has a population of 5,602 and is the 6,008th largest city in the United States. The population density is 5,918 per sq mi which is 2447% higher than the California average and 6432% higher than the national average. The median age in Kensington is 51 which is approximately 42% higher than the California average of 36. In Kensington, 65% of the population over 15 years of age are married, 82% speak English and 2% speak Spanish. 44% of Kensington residents were born in California, 39% were born out of state, 2% were born outside of the United States and 15% were foreign born.