Winchester, CA has a population of 2,407 and is the 10,042nd largest city in the United States. The population density is 301 per sq mi which is 29% higher than the California average and 232% higher than the national average. The median age in Winchester is 37 which is approximately 4% higher than the California average of 36. In Winchester, 52% of the population over 15 years of age are married, 60% speak English and 39% speak Spanish. 66% of Winchester residents were born in California, 15% were born out of state, 0% were born outside of the United States and 19% were foreign born.