Plainsboro Center, NJ has a population of 2,733 and is the 9,291st largest city in the United States. The population density is 3,602 per sq mi which is 360130% higher than the New Jersey average and 3876% higher than the national average. The median age in Plainsboro Center is 35 which is approximately 13% lower than the New Jersey average of 40. In Plainsboro Center, 72% of the population over 15 years of age are married, 46% speak English and 3% speak Spanish. 26% of Plainsboro Center residents were born in New Jersey, 22% were born out of state, 1% were born outside of the United States and 52% were foreign born.