Crestline, CA has a population of 8,900 and is the 4,309th largest city in the United States. The population density is 643 per sq mi which is 177% higher than the California average and 610% higher than the national average. The median age in Crestline is 47 which is approximately 31% higher than the California average of 36. In Crestline, 60% of the population over 15 years of age are married, 90% speak English and 7% speak Spanish. 69% of Crestline residents were born in California, 23% were born out of state, 1% were born outside of the United States and 6% were foreign born.