Fontana, CA has a population of 205,228 and is the 109th largest city in the United States. The population density is 4,771 per sq mi which is 1953% higher than the California average and 5166% higher than the national average. The median age in Fontana is 30 which is approximately 16% lower than the California average of 36. In Fontana, 51% of the population over 15 years of age are married, 41% speak English and 51% speak Spanish. 62% of Fontana residents were born in California, 8% were born out of state, 1% were born outside of the United States and 29% were foreign born.