Greenville, CA has a population of 1,002 and is the 15,145th largest city in the United States. The population density is 125 per sq mi which is 46% lower than the California average and 38% higher than the national average. The median age in Greenville is 54 which is approximately 50% higher than the California average of 36. In Greenville, 47% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 63% of Greenville residents were born in California, 32% were born out of state, 4% were born outside of the United States and 1% were foreign born.