Green Valley, CA has a population of 1,224 and is the 13,915th largest city in the United States. The population density is 145 per sq mi which is 37% lower than the California average and 61% higher than the national average. The median age in Green Valley is 61 which is approximately 70% higher than the California average of 36. In Green Valley, 81% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 45% of Green Valley residents were born in California, 50% were born out of state, 4% were born outside of the United States and 1% were foreign born.