Geyserville, CA has a population of 975 and is the 15,321st largest city in the United States. The population density is 216 per sq mi which is 7% lower than the California average and 138% higher than the national average. The median age in Geyserville is 41 which is approximately 14% higher than the California average of 36. In Geyserville, 59% of the population over 15 years of age are married, 61% speak English and 39% speak Spanish. 52% of Geyserville residents were born in California, 16% were born out of state, 2% were born outside of the United States and 30% were foreign born.