Concord, CA has a population of 126,938 and is the 220th largest city in the United States. The population density is 4,156 per sq mi which is 1688% higher than the California average and 4487% higher than the national average. The median age in Concord is 38 which is approximately 5% higher than the California average of 36. In Concord, 55% of the population over 15 years of age are married, 64% speak English and 23% speak Spanish. 55% of Concord residents were born in California, 17% were born out of state, 1% were born outside of the United States and 27% were foreign born.