Jackson, CA has a population of 4,630 and is the 6,801st largest city in the United States. The population density is 1,288 per sq mi which is 454% higher than the California average and 1322% higher than the national average. The median age in Jackson is 48 which is approximately 32% higher than the California average of 36. In Jackson, 57% of the population over 15 years of age are married, 92% speak English and 4% speak Spanish. 66% of Jackson residents were born in California, 27% were born out of state, 0% were born outside of the United States and 6% were foreign born.