La Cañada Flintridge, CA has a population of 20,477 and is the 2,118th largest city in the United States. The population density is 2,373 per sq mi which is 921% higher than the California average and 2519% higher than the national average. The median age in La Cañada Flintridge is 44 which is approximately 23% higher than the California average of 36. In La Cañada Flintridge, 68% of the population over 15 years of age are married, 66% speak English and 5% speak Spanish. 57% of La Cañada Flintridge residents were born in California, 18% were born out of state, 1% were born outside of the United States and 24% were foreign born.