Fortuna, CA has a population of 11,917 and is the 3,437th largest city in the United States. The population density is 2,460 per sq mi which is 958% higher than the California average and 2615% higher than the national average. The median age in Fortuna is 39 which is approximately 9% higher than the California average of 36. In Fortuna, 54% of the population over 15 years of age are married, 85% speak English and 14% speak Spanish. 68% of Fortuna residents were born in California, 22% were born out of state, 0% were born outside of the United States and 10% were foreign born.