Twin Lakes, CA has a population of 5,378 and is the 6,151st largest city in the United States. The population density is 7,790 per sq mi which is 3252% higher than the California average and 8498% higher than the national average. The median age in Twin Lakes is 39 which is approximately 9% higher than the California average of 36. In Twin Lakes, 47% of the population over 15 years of age are married, 76% speak English and 23% speak Spanish. 66% of Twin Lakes residents were born in California, 19% were born out of state, 1% were born outside of the United States and 14% were foreign born.