Pioneer, CA has a population of 1,211 and is the 13,968th largest city in the United States. The population density is 281 per sq mi which is 21% higher than the California average and 210% higher than the national average. The median age in Pioneer is 57 which is approximately 58% higher than the California average of 36. In Pioneer, 73% of the population over 15 years of age are married, 91% speak English and 6% speak Spanish. 66% of Pioneer residents were born in California, 30% were born out of state, 0% were born outside of the United States and 4% were foreign born.