Cottonwood, CA has a population of 3,644 and is the 7,860th largest city in the United States. The population density is 1,570 per sq mi which is 575% higher than the California average and 1632% higher than the national average. The median age in Cottonwood is 35 which is approximately 3% lower than the California average of 36. In Cottonwood, 50% of the population over 15 years of age are married, 81% speak English and 15% speak Spanish. 62% of Cottonwood residents were born in California, 28% were born out of state, 0% were born outside of the United States and 10% were foreign born.