Porterville, CA has a population of 58,472 and is the 678th largest city in the United States. The population density is 3,159 per sq mi which is 1259% higher than the California average and 3386% higher than the national average. The median age in Porterville is 29 which is approximately 19% lower than the California average of 36. In Porterville, 51% of the population over 15 years of age are married, 45% speak English and 51% speak Spanish. 70% of Porterville residents were born in California, 8% were born out of state, 1% were born outside of the United States and 22% were foreign born.