Woodbridge, NJ has a population of 18,869 and is the 2,318th largest city in the United States. The population density is 4,855 per sq mi which is 485353% higher than the New Jersey average and 5258% higher than the national average. The median age in Woodbridge is 37 which is approximately 6% lower than the New Jersey average of 40. In Woodbridge, 61% of the population over 15 years of age are married, 55% speak English and 18% speak Spanish. 48% of Woodbridge residents were born in New Jersey, 16% were born out of state, 2% were born outside of the United States and 34% were foreign born.