Penn Valley, CA has a population of 1,607 and is the 12,306th largest city in the United States. The population density is 757 per sq mi which is 226% higher than the California average and 736% higher than the national average. The median age in Penn Valley is 45 which is approximately 24% higher than the California average of 36. In Penn Valley, 43% of the population over 15 years of age are married, 93% speak English and 1% speak Spanish. 74% of Penn Valley residents were born in California, 16% were born out of state, 4% were born outside of the United States and 5% were foreign born.