Concordia, NJ has a population of 3,156 and is the 8,555th largest city in the United States. The population density is 3,030 per sq mi which is 302936% higher than the New Jersey average and 3245% higher than the national average. The median age in Concordia is 76 which is approximately 93% higher than the New Jersey average of 40. In Concordia, 81% of the population over 15 years of age are married, 86% speak English and 4% speak Spanish. 24% of Concordia residents were born in New Jersey, 61% were born out of state, 0% were born outside of the United States and 15% were foreign born.