Lake Isabella, CA has a population of 3,606 and is the 7,909th largest city in the United States. The population density is 166 per sq mi which is 29% lower than the California average and 83% higher than the national average. The median age in Lake Isabella is 58 which is approximately 60% higher than the California average of 36. In Lake Isabella, 57% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 63% of Lake Isabella residents were born in California, 35% were born out of state, 0% were born outside of the United States and 2% were foreign born.