Twain Harte, CA has a population of 2,275 and is the 10,317th largest city in the United States. The population density is 615 per sq mi which is 165% higher than the California average and 579% higher than the national average. The median age in Twain Harte is 58 which is approximately 61% higher than the California average of 36. In Twain Harte, 70% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 58% of Twain Harte residents were born in California, 39% were born out of state, 3% were born outside of the United States and 0% were foreign born.