Contra Costa Centre, CA has a population of 6,190 and is the 5,640th largest city in the United States. The population density is 9,725 per sq mi which is 4085% higher than the California average and 10634% higher than the national average. The median age in Contra Costa Centre is 35 which is approximately 3% lower than the California average of 36. In Contra Costa Centre, 49% of the population over 15 years of age are married, 69% speak English and 5% speak Spanish. 41% of Contra Costa Centre residents were born in California, 29% were born out of state, 0% were born outside of the United States and 31% were foreign born.