Willow Creek, CA has a population of 1,507 and is the 12,654th largest city in the United States. The population density is 50 per sq mi which is 79% lower than the California average and 45% lower than the national average. The median age in Willow Creek is 41 which is approximately 14% higher than the California average of 36. In Willow Creek, 50% of the population over 15 years of age are married, 91% speak English and 8% speak Spanish. 61% of Willow Creek residents were born in California, 33% were born out of state, 0% were born outside of the United States and 6% were foreign born.