Pine Grove, CA has a population of 1,653 and is the 12,133rd largest city in the United States. The population density is 237 per sq mi which is 2% higher than the California average and 162% higher than the national average. The median age in Pine Grove is 62 which is approximately 73% higher than the California average of 36. In Pine Grove, 69% of the population over 15 years of age are married, 89% speak English and 8% speak Spanish. 54% of Pine Grove residents were born in California, 35% were born out of state, 0% were born outside of the United States and 11% were foreign born.