Durham, CA has a population of 5,660 and is the 5,974th largest city in the United States. The population density is 69 per sq mi which is 70% lower than the California average and 24% lower than the national average. The median age in Durham is 43 which is approximately 21% higher than the California average of 36. In Durham, 63% of the population over 15 years of age are married, 93% speak English and 5% speak Spanish. 81% of Durham residents were born in California, 16% were born out of state, 0% were born outside of the United States and 3% were foreign born.