Windsor, CA has a population of 27,318 and is the 1,580th largest city in the United States. The population density is 3,758 per sq mi which is 1517% higher than the California average and 4048% higher than the national average. The median age in Windsor is 40 which is approximately 12% higher than the California average of 36. In Windsor, 62% of the population over 15 years of age are married, 73% speak English and 23% speak Spanish. 65% of Windsor residents were born in California, 17% were born out of state, 2% were born outside of the United States and 17% were foreign born.